com.icl.saxon.om

## Class AbstractNode

- java.lang.Object
- - com.icl.saxon.om.AbstractNode

- All Implemented Interfaces:
    NodeInfo, javax.xml.transform.dom.DOMLocator, javax.xml.transform.Source, javax.xml.transform.SourceLocator, org.w3c.dom.Node
  Direct Known Subclasses:
    NodeImpl, TinyDocumentImpl

      public abstract class AbstractNode
      extends java.lang.Object
      implements org.w3c.dom.Node, NodeInfo, javax.xml.transform.SourceLocator, javax.xml.transform.dom.DOMLocator

  This class is an abstract implementation of the Saxon NodeInfo interface; it also contains concrete implementations of most of the DOM methods in terms of the NodeInfo methods. These include all the methods defined on the DOM Node class itself, and most of those defined on subclasses such as Document, Text, and Comment: because of the absence of multiple inheritance, this is the only way of making these methods reusable by multiple implementations. The class contains no data, and can be used as a common superclass for different implementations of Node and NodeInfo.

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static char[]` | `NODE_LETTER` Chararacteristic letters to identify each type of node, indexed using the node type values.

    - ### Fields inherited from interface org.w3c.dom.Node

      `ATTRIBUTE_NODE, CDATA_SECTION_NODE, COMMENT_NODE, DOCUMENT_FRAGMENT_NODE, DOCUMENT_NODE, DOCUMENT_POSITION_CONTAINED_BY, DOCUMENT_POSITION_CONTAINS, DOCUMENT_POSITION_DISCONNECTED, DOCUMENT_POSITION_FOLLOWING, DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC, DOCUMENT_POSITION_PRECEDING, DOCUMENT_TYPE_NODE, ELEMENT_NODE, ENTITY_NODE, ENTITY_REFERENCE_NODE, NOTATION_NODE, PROCESSING_INSTRUCTION_NODE, TEXT_NODE`

    - ### Fields inherited from interface com.icl.saxon.om.NodeInfo

      `ATTRIBUTE, COMMENT, ELEMENT, NAMESPACE, NODE, NONE, NUMBER_OF_TYPES, PI, ROOT, TEXT`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `AbstractNode()`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `org.w3c.dom.Node` | `appendChild(org.w3c.dom.Node newChild)` Adds the node `newChild` to the end of the list of children of this node.
    `void` | `appendData(java.lang.String arg)` Append the string to the end of the character data of the node.
    `org.w3c.dom.Node` | `cloneNode(boolean deep)` Returns a duplicate of this node, i.e., serves as a generic copy constructor for nodes.
    `short` | `compareDocumentPosition(org.w3c.dom.Node other)` Compares the reference node, i.e.
    `abstract int` | `compareOrder(NodeInfo other)` Determine the relative position of this node and another node, in document order.
    `void` | `copyStringValue(Outputter out)` Copy the string-value of this node to a given outputter.
    `org.w3c.dom.Attr` | `createAttribute(java.lang.String name)` Create an `Attr` of the given name.
    `org.w3c.dom.Attr` | `createAttributeNS(java.lang.String namespaceURI, java.lang.String qualifiedName)` Create an attribute of the given qualified name and namespace URI.
    `org.w3c.dom.CDATASection` | `createCDATASection(java.lang.String data)` Create a `CDATASection` node whose value is the specified string.
    `org.w3c.dom.Comment` | `createComment(java.lang.String data)` Create a `Comment` node given the specified string.
    `org.w3c.dom.DocumentFragment` | `createDocumentFragment()` Creates an empty `DocumentFragment` object.
    `org.w3c.dom.Element` | `createElement(java.lang.String tagName)` Creates an element of the type specified.
    `org.w3c.dom.Element` | `createElementNS(java.lang.String namespaceURI, java.lang.String qualifiedName)` Create an element of the given qualified name and namespace URI.
    `org.w3c.dom.EntityReference` | `createEntityReference(java.lang.String name)` Create an `EntityReference` object.
    `org.w3c.dom.ProcessingInstruction` | `createProcessingInstruction(java.lang.String target, java.lang.String data)` Create a `ProcessingInstruction` node given the specified name and data strings.
    `org.w3c.dom.Text` | `createTextNode(java.lang.String data)` Create a `Text` node given the specified string.
    `void` | `deleteData(int offset, int count)` Remove a range of 16-bit units from the node.
    `protected void` | `disallowUpdate()` Internal method used to indicate that update operations are not allowed
    `abstract java.lang.String` | `generateId()` Get a character string that uniquely identifies this node
    `java.lang.String` | `getAttribute(java.lang.String name)` Retrieves an attribute value by name.
    `org.w3c.dom.Attr` | `getAttributeNode(java.lang.String name)` Retrieves an attribute node by name.
    `org.w3c.dom.Attr` | `getAttributeNodeNS(java.lang.String namespaceURI, java.lang.String localName)` Retrieves an `Attr` node by local name and namespace URI.
    `java.lang.String` | `getAttributeNS(java.lang.String namespaceURI, java.lang.String localName)` Retrieves an attribute value by local name and namespace URI.
    `org.w3c.dom.NamedNodeMap` | `getAttributes()` Return a `NamedNodeMap` containing the attributes of this node (if it is an `Element` ) or `null` otherwise.
    `abstract java.lang.String` | `getAttributeValue(int fingerprint)` Get the value of a given attribute of this node
    `abstract java.lang.String` | `getAttributeValue(java.lang.String uri, java.lang.String localName)` Find the value of a given attribute of this node.
    `abstract java.lang.String` | `getBaseURI()` Get the base URI for the node.
    `org.w3c.dom.NodeList` | `getChildNodes()` Return a `NodeList` that contains all children of this node.
    `int` | `getColumnNumber()` Get the column number of the node.
    `java.lang.String` | `getData()` Get the character data of a Text or Comment node.
    `java.lang.String` | `getDisplayName()` Get the display name of this node.
    `org.w3c.dom.DocumentType` | `getDoctype()` Get the Document Type Declaration (see `DocumentType` ) associated with this document.
    `org.w3c.dom.Element` | `getDocumentElement()` Get the outermost element.
    `DocumentInfo` | `getDocumentRoot()` Get the root (document) node
    `org.w3c.dom.Element` | `getElementById(java.lang.String elementId)` Return the `Element` whose `ID` is given by `elementId` .
    `org.w3c.dom.NodeList` | `getElementsByTagName(java.lang.String tagname)` Return a `NodeList` of all the `Elements` with a given tag name in the order in which they are encountered in a preorder traversal of the `Document` tree.
    `org.w3c.dom.NodeList` | `getElementsByTagNameNS(java.lang.String namespaceURI, java.lang.String localName)` Return a `NodeList` of all the `Elements` with a given local name and namespace URI in the order in which they are encountered in a preorder traversal of the `Document` tree.
    `abstract AxisEnumeration` | `getEnumeration(byte axisNumber, NodeTest nodeTest)` Return an enumeration over the nodes reached by the given axis from this node
    `java.lang.Object` | `getFeature(java.lang.String feature, java.lang.String version)` This method returns a specialized object which implements the specialized APIs of the specified feature and version, as specified in .
    `abstract int` | `getFingerprint()` Get the fingerprint of the node, used for matching names
    `org.w3c.dom.Node` | `getFirstChild()` Get first child (DOM method)
    `org.w3c.dom.DOMImplementation` | `getImplementation()` Get a `DOMImplementation` object that handles this document.
    `org.w3c.dom.Node` | `getLastChild()` Get last child (DOM method)
    `int` | `getLength()` Get the length of a Text or Comment node.
    `int` | `getLineNumber()` Get the line number of the node within its source document entity.
    `abstract java.lang.String` | `getLocalName()` Get the local name of this node.
    `java.lang.String` | `getName()` Get the name of an attribute node (the QName) (DOM method)
    `abstract int` | `getNameCode()` Get the name code of the node, used for displaying names
    `java.lang.String` | `getNamespaceURI()` The namespace URI of this node, or `null` if it is unspecified.
    `org.w3c.dom.Node` | `getNextSibling()` Get next sibling node (DOM method)
    `java.lang.String` | `getNodeName()` Get the name of this node, following the DOM rules
    `java.lang.String` | `getNodeValue()` Get the node value as defined in the DOM.
    `org.w3c.dom.Node` | `getOriginatingNode()` Get the node corresponding to this javax.xml.transform.dom.DOMLocator
    `org.w3c.dom.Document` | `getOwnerDocument()` Return the `Document` object associated with this node.
    `org.w3c.dom.Element` | `getOwnerElement()` The `Element` node this attribute is attached to or `null` if this attribute is not in use.
    `abstract NodeInfo` | `getParent()` Find the parent node of this node.
    `org.w3c.dom.Node` | `getParentNode()` Find the parent node of this node (DOM method).
    `abstract java.lang.String` | `getPrefix()` Get the prefix part of the name of this node.
    `org.w3c.dom.Node` | `getPreviousSibling()` Get the previous sibling of the node (DOM method)
    `java.lang.String` | `getPublicId()` Get the public identifier of the document entity containing this node.
    `TypeInfo` | `getSchemaTypeInfo()` The type information associated with this attribute.
    `boolean` | `getSpecified()` If this attribute was explicitly given a value in the original document, this is `true` ; otherwise, it is `false`.
    `abstract java.lang.String` | `getSystemId()` Get the system ID for the entity containing the node.
    `java.lang.String` | `getTagName()` The name of the element (DOM interface).
    `java.lang.String` | `getTextContent()` This attribute returns the text content of this node and its descendants.
    `abstract java.lang.String` | `getURI()` Get the URI part of the name of this node.
    `java.lang.Object` | `getUserData(java.lang.String key)` Retrieves the object associated to a key on a this node.
    `java.lang.String` | `getValue()` Return the character value of an attribute node (DOM method)
    `java.lang.String` | `getWholeText()` Returns all text of `Text` nodes logically-adjacent text nodes to this node, concatenated in document order.
    `boolean` | `hasAttribute(java.lang.String name)` Returns `true` when an attribute with a given name is specified on this element or has a default value, `false` otherwise.
    `boolean` | `hasAttributeNS(java.lang.String namespaceURI, java.lang.String localName)` Returns `true` when an attribute with a given local name and namespace URI is specified on this element or has a default value, `false` otherwise.
    `abstract boolean` | `hasAttributes()` Returns whether this node has any attributes.
    `abstract boolean` | `hasChildNodes()` Determine whether the node has any children.
    `org.w3c.dom.Node` | `importNode(org.w3c.dom.Node importedNode, boolean deep)` Import a node from another document to this document.
    `org.w3c.dom.Node` | `insertBefore(org.w3c.dom.Node newChild, org.w3c.dom.Node refChild)` Insert the node `newChild` before the existing child node `refChild`.
    `void` | `insertData(int offset, java.lang.String arg)` Insert a string at the specified character offset.
    `boolean` | `isDefaultNamespace(java.lang.String namespaceURI)` This method checks if the specified `namespaceURI` is the default namespace or not.
    `boolean` | `isElementContentWhitespace()` Returns whether this text node contains element content whitespace, often abusively called "ignorable whitespace".
    `boolean` | `isEqualNode(org.w3c.dom.Node arg)` Tests whether two nodes are equal.
    `boolean` | `isId()` Returns whether this attribute is known to be of type ID (i.e.
    `boolean` | `isSameNode(org.w3c.dom.Node other)` Returns whether this node is the same node as the given one.
    `abstract boolean` | `isSameNodeInfo(NodeInfo other)` Determine whether this is the same node as another node
    `boolean` | `isSupported(java.lang.String feature, java.lang.String version)` Tests whether the DOM implementation implements a specific feature and that feature is supported by this node.
    `java.lang.String` | `lookupNamespaceURI(java.lang.String prefix)` Look up the namespace URI associated to the given prefix, starting from this node.
    `java.lang.String` | `lookupPrefix(java.lang.String namespaceURI)` Look up the prefix associated to the given namespace URI, starting from this node.
    `void` | `normalize()` Puts all `Text` nodes in the full depth of the sub-tree underneath this `Node`, including attribute nodes, into a "normal" form where only structure (e.g., elements, comments, processing instructions, CDATA sections, and entity references) separates `Text` nodes, i.e., there are neither adjacent `Text` nodes nor empty `Text` nodes.
    `void` | `outputNamespaceNodes(Outputter out, boolean includeAncestors)` Output all namespace nodes associated with this element.
    `void` | `removeAttribute(java.lang.String oldAttr)` Removes the specified attribute.
    `org.w3c.dom.Attr` | `removeAttributeNode(org.w3c.dom.Attr oldAttr)` Removes the specified attribute node.
    `void` | `removeAttributeNS(java.lang.String namespaceURI, java.lang.String localName)` Removes an attribute by local name and namespace URI.
    `org.w3c.dom.Node` | `removeChild(org.w3c.dom.Node oldChild)` Remove the child node indicated by `oldChild` from the list of children, and returns it.
    `org.w3c.dom.Node` | `replaceChild(org.w3c.dom.Node newChild, org.w3c.dom.Node oldChild)` Replace the child node `oldChild` with `newChild` in the list of children, and returns the `oldChild` node.
    `void` | `replaceData(int offset, int count, java.lang.String arg)` Replace the characters starting at the specified 16-bit unit offset with the specified string.
    `org.w3c.dom.Text` | `replaceWholeText(java.lang.String content)` Replaces the text of the current node and all logically-adjacent text nodes with the specified text.
    `org.w3c.dom.Attr` | `setAttributeNode(org.w3c.dom.Attr newAttr)` Adds a new attribute node.
    `org.w3c.dom.Attr` | `setAttributeNodeNS(org.w3c.dom.Attr newAttr)` Add a new attribute.
    `void` | `setAttributeNS(java.lang.String namespaceURI, java.lang.String qualifiedName, java.lang.String value)` Adds a new attribute.
    `void` | `setData(java.lang.String data)` Set the character data of a Text or Comment node.
    `void` | `setIdAttribute(java.lang.String name, boolean isId)` If the parameter `isId` is `true`, this method declares the specified attribute to be a user-determined ID attribute .
    `void` | `setIdAttributeNode(org.w3c.dom.Attr idAttr, boolean isId)` If the parameter `isId` is `true`, this method declares the specified attribute to be a user-determined ID attribute .
    `void` | `setIdAttributeNS(java.lang.String namespaceURI, java.lang.String localName, boolean isId)` If the parameter `isId` is `true`, this method declares the specified attribute to be a user-determined ID attribute .
    `void` | `setNodeValue(java.lang.String nodeValue)` Set the node value.
    `void` | `setPrefix(java.lang.String prefix)` Set the namespace prefix of this node.
    `void` | `setTextContent(java.lang.String textContent)` This attribute returns the text content of this node and its descendants.
    `java.lang.Object` | `setUserData(java.lang.String key, java.lang.Object data, UserDataHandler handler)` Associate an object to a key on this node.
    `void` | `setValue(java.lang.String value)` Set the value of an attribute node.
    `org.w3c.dom.Text` | `splitText(int offset)` Break this node into two nodes at the specified offset, keeping both in the tree as siblings.
    `java.lang.String` | `substringData(int offset, int count)` Extract a range of data from a Text or Comment node.
    `boolean` | `supports(java.lang.String feature, java.lang.String version)` Alternative to isSupported(), defined in a draft DOM spec

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

    - ### Methods inherited from interface org.w3c.dom.Node

      `getNodeType`

    - ### Methods inherited from interface com.icl.saxon.om.NodeInfo

      `copy, getNodeType, getStringValue`

    - ### Methods inherited from interface javax.xml.transform.Source

      `setSystemId`

- - ### Field Detail

    - #### NODE_LETTER

          public static final char[] NODE_LETTER

      Chararacteristic letters to identify each type of node, indexed using the node type values. These are used as the initial letter of the result of generate-id()

  - ### Constructor Detail

    - #### AbstractNode

          public AbstractNode()

  - ### Method Detail

    - #### isSameNodeInfo

          public abstract boolean isSameNodeInfo(NodeInfo other)

      Determine whether this is the same node as another node
      Specified by:
        `isSameNodeInfo` in interface `NodeInfo`
      Returns:
        true if this Node object and the supplied Node object represent the same node in the tree.

    - #### generateId

          public abstract java.lang.String generateId()

      Get a character string that uniquely identifies this node
      Specified by:
        `generateId` in interface `NodeInfo`
      Returns:
        a string.

    - #### getSystemId

          public abstract java.lang.String getSystemId()

      Get the system ID for the entity containing the node.
      Specified by:
        `getSystemId` in interface `NodeInfo`
      Specified by:
        `getSystemId` in interface `javax.xml.transform.Source`
      Specified by:
        `getSystemId` in interface `javax.xml.transform.SourceLocator`
      Returns:
        the System Identifier of the entity in the source document containing the node, or null if not known. Note this is not the same as the base URI: the base URI can be modified by xml:base, but the system ID cannot.

    - #### getBaseURI

          public abstract java.lang.String getBaseURI()

      Get the base URI for the node. Default implementation for child nodes gets the base URI of the parent node.
      Specified by:
        `getBaseURI` in interface `NodeInfo`
      Specified by:
        `getBaseURI` in interface `org.w3c.dom.Node`

    - #### getOriginatingNode

          public org.w3c.dom.Node getOriginatingNode()

      Get the node corresponding to this javax.xml.transform.dom.DOMLocator
      Specified by:
        `getOriginatingNode` in interface `javax.xml.transform.dom.DOMLocator`

    - #### compareOrder

          public abstract int compareOrder(NodeInfo other)

      Determine the relative position of this node and another node, in document order. The other node will always be in the same document.
      Specified by:
        `compareOrder` in interface `NodeInfo`
      Parameters:
        `other` - The other node, whose position is to be compared with this node
      Returns:
        -1 if this node precedes the other node, +1 if it follows the other node, or 0 if they are the same node. (In this case, isSameNode() will always return true, and the two nodes will produce the same result for generateId())

    - #### getNameCode

          public abstract int getNameCode()

      Get the name code of the node, used for displaying names
      Specified by:
        `getNameCode` in interface `NodeInfo`
      See Also:
        `allocate`, `getFingerprint`

    - #### getFingerprint

          public abstract int getFingerprint()

      Get the fingerprint of the node, used for matching names
      Specified by:
        `getFingerprint` in interface `NodeInfo`

    - #### getNodeName

          public java.lang.String getNodeName()

      Get the name of this node, following the DOM rules
      Specified by:
        `getNodeName` in interface `org.w3c.dom.Node`
      Returns:
        The name of the node. For an element this is the element name, for an attribute it is the attribute name, as a QName. Other node types return conventional names such as "#text" or "#comment"

    - #### getPrefix

          public abstract java.lang.String getPrefix()

      Get the prefix part of the name of this node. This is the name before the ":" if any.
      Specified by:
        `getPrefix` in interface `NodeInfo`
      Specified by:
        `getPrefix` in interface `org.w3c.dom.Node`
      Returns:
        the prefix part of the name. For an unnamed node, return "".

    - #### getURI

          public abstract java.lang.String getURI()

      Get the URI part of the name of this node. This is the URI corresponding to the prefix, or the URI of the default namespace if appropriate.
      Specified by:
        `getURI` in interface `NodeInfo`
      Returns:
        The URI of the namespace of this node. For an unnamed node, or for an element or attribute in the default namespace, return an empty string.

    - #### getDisplayName

          public java.lang.String getDisplayName()

      Get the display name of this node. For elements and attributes this is [prefix:]localname. For unnamed nodes, it is an empty string.
      Specified by:
        `getDisplayName` in interface `NodeInfo`
      Returns:
        The display name of this node. For a node with no name, return an empty string.

    - #### getLocalName

          public abstract java.lang.String getLocalName()

      Get the local name of this node.
      Specified by:
        `getLocalName` in interface `NodeInfo`
      Specified by:
        `getLocalName` in interface `org.w3c.dom.Node`
      Returns:
        The local name of this node. For a node with no name, return an empty string.

    - #### hasChildNodes

          public abstract boolean hasChildNodes()

      Determine whether the node has any children.
      Specified by:
        `hasChildNodes` in interface `NodeInfo`
      Specified by:
        `hasChildNodes` in interface `org.w3c.dom.Node`
      Returns:
        `true` if this node has any attributes, `false` otherwise.

    - #### hasAttributes

          public abstract boolean hasAttributes()

      Returns whether this node has any attributes.
      Specified by:
        `hasAttributes` in interface `org.w3c.dom.Node`
      Returns:
        `true` if this node has any attributes, `false` otherwise.
      Since:
        DOM Level 2

    - #### getAttributeValue

          public abstract java.lang.String getAttributeValue(java.lang.String uri,
                                           java.lang.String localName)

      Find the value of a given attribute of this node.
      This method is defined on all nodes to meet XSL requirements, but for nodes other than elements it will always return null.
      Specified by:
        `getAttributeValue` in interface `NodeInfo`
      Parameters:
        `uri` - the namespace uri of an attribute
        `localName` - the local name of an attribute
      Returns:
        the value of the attribute, if it exists, otherwise null

    - #### getAttributeValue

          public abstract java.lang.String getAttributeValue(int fingerprint)

      Get the value of a given attribute of this node
      Specified by:
        `getAttributeValue` in interface `NodeInfo`
      Parameters:
        `fingerprint` - The fingerprint of the attribute name
      Returns:
        the attribute value if it exists or null if not

    - #### getLineNumber

          public int getLineNumber()

      Get the line number of the node within its source document entity. The default implementation returns -1, meaning unknown
      Specified by:
        `getLineNumber` in interface `NodeInfo`
      Specified by:
        `getLineNumber` in interface `javax.xml.transform.SourceLocator`
      Returns:
        the line number of the node in its original source document; or -1 if not available

    - #### getColumnNumber

          public int getColumnNumber()

      Get the column number of the node. The default implementation returns -1, meaning unknown
      Specified by:
        `getColumnNumber` in interface `javax.xml.transform.SourceLocator`

    - #### getPublicId

          public java.lang.String getPublicId()

      Get the public identifier of the document entity containing this node. The default implementation returns null, meaning unknown
      Specified by:
        `getPublicId` in interface `javax.xml.transform.SourceLocator`

    - #### getEnumeration

          public abstract AxisEnumeration getEnumeration(byte axisNumber,
                                       NodeTest nodeTest)

      Return an enumeration over the nodes reached by the given axis from this node
      Specified by:
        `getEnumeration` in interface `NodeInfo`
      Parameters:
        `axisNumber` - The axis to be used (a constant in class `Axis`)
        `nodeTest` - A pattern to be matched by the returned nodes
      Returns:
        a AxisEnumeration that scans the nodes reached by the axis in turn.

    - #### getParent

          public abstract NodeInfo getParent()

      Find the parent node of this node.
      Specified by:
        `getParent` in interface `NodeInfo`
      Returns:
        The Node object describing the containing element or root node.

    - #### getDocumentRoot

          public DocumentInfo getDocumentRoot()

      Get the root (document) node
      Specified by:
        `getDocumentRoot` in interface `NodeInfo`
      Returns:
        the DocumentInfo representing the containing document

    - #### getParentNode

          public org.w3c.dom.Node getParentNode()

      Find the parent node of this node (DOM method).
      Specified by:
        `getParentNode` in interface `org.w3c.dom.Node`
      Returns:
        The Node object describing the containing element or root node.

    - #### getPreviousSibling

          public org.w3c.dom.Node getPreviousSibling()

      Get the previous sibling of the node (DOM method)
      Specified by:
        `getPreviousSibling` in interface `org.w3c.dom.Node`
      Returns:
        The previous sibling node. Returns null if the current node is the first child of its parent.

    - #### getNextSibling

          public org.w3c.dom.Node getNextSibling()

      Get next sibling node (DOM method)
      Specified by:
        `getNextSibling` in interface `org.w3c.dom.Node`
      Returns:
        The next sibling node. Returns null if the current node is the last child of its parent.

    - #### getFirstChild

          public org.w3c.dom.Node getFirstChild()

      Get first child (DOM method)
      Specified by:
        `getFirstChild` in interface `org.w3c.dom.Node`
      Returns:
        the first child node of this node, or null if it has no children

    - #### getLastChild

          public org.w3c.dom.Node getLastChild()

      Get last child (DOM method)
      Specified by:
        `getLastChild` in interface `org.w3c.dom.Node`
      Returns:
        last child of this node, or null if it has no children

    - #### getDocumentElement

          public org.w3c.dom.Element getDocumentElement()

      Get the outermost element. (DOM method)
      Returns:
        the Element for the outermost element of the document. If the document is not well-formed, this returns the last element child of the root if there is one, otherwise null.

    - #### copyStringValue

          public void copyStringValue(Outputter out)
                               throws javax.xml.transform.TransformerException

      Copy the string-value of this node to a given outputter. Default implementation does "out.writeContent(getStringValue());" but it is useful to provide an optimized implementation.
      Specified by:
        `copyStringValue` in interface `NodeInfo`
      Throws:
        `javax.xml.transform.TransformerException`

    - #### outputNamespaceNodes

          public void outputNamespaceNodes(Outputter out,
                                  boolean includeAncestors)
                                    throws javax.xml.transform.TransformerException

      Output all namespace nodes associated with this element. Does nothing if the node is not an element.
      Specified by:
        `outputNamespaceNodes` in interface `NodeInfo`
      Parameters:
        `out` - The relevant outputter
        `includeAncestors` - True if namespaces declared on ancestor elements must be output; false if it is known that these are already on the result tree
      Throws:
        `javax.xml.transform.TransformerException`

    - #### getNodeValue

          public java.lang.String getNodeValue()

      Get the node value as defined in the DOM. This is not necessarily the same as the XPath string-value.
      Specified by:
        `getNodeValue` in interface `org.w3c.dom.Node`

    - #### setNodeValue

          public void setNodeValue(java.lang.String nodeValue)
                            throws org.w3c.dom.DOMException

      Set the node value. DOM method: always fails
      Specified by:
        `setNodeValue` in interface `org.w3c.dom.Node`
      Throws:
        `org.w3c.dom.DOMException`

    - #### getChildNodes

          public org.w3c.dom.NodeList getChildNodes()

      Return a `NodeList` that contains all children of this node. If there are no children, this is a `NodeList` containing no nodes. DOM Method.
      Specified by:
        `getChildNodes` in interface `org.w3c.dom.Node`

    - #### getAttributes

          public org.w3c.dom.NamedNodeMap getAttributes()

      Return a `NamedNodeMap` containing the attributes of this node (if it is an `Element` ) or `null` otherwise. (DOM method)
      Specified by:
        `getAttributes` in interface `org.w3c.dom.Node`

    - #### getOwnerDocument

          public org.w3c.dom.Document getOwnerDocument()

      Return the `Document` object associated with this node. (DOM method)
      Specified by:
        `getOwnerDocument` in interface `org.w3c.dom.Node`

    - #### insertBefore

          public org.w3c.dom.Node insertBefore(org.w3c.dom.Node newChild,
                                      org.w3c.dom.Node refChild)
                                        throws org.w3c.dom.DOMException

      Insert the node `newChild` before the existing child node `refChild`. DOM method: always fails.
      Specified by:
        `insertBefore` in interface `org.w3c.dom.Node`
      Parameters:
        `newChild` - The node to insert.
        `refChild` - The reference node, i.e., the node before which the new node must be inserted.
      Returns:
        The node being inserted.
      Throws:
        `org.w3c.dom.DOMException` - NO_MODIFICATION_ALLOWED_ERR: Always raised.

    - #### replaceChild

          public org.w3c.dom.Node replaceChild(org.w3c.dom.Node newChild,
                                      org.w3c.dom.Node oldChild)
                                        throws org.w3c.dom.DOMException

      Replace the child node `oldChild` with `newChild` in the list of children, and returns the `oldChild` node. Always fails.
      Specified by:
        `replaceChild` in interface `org.w3c.dom.Node`
      Parameters:
        `newChild` - The new node to put in the child list.
        `oldChild` - The node being replaced in the list.
      Returns:
        The node replaced.
      Throws:
        `org.w3c.dom.DOMException` - NO_MODIFICATION_ALLOWED_ERR: Always raised.

    - #### removeChild

          public org.w3c.dom.Node removeChild(org.w3c.dom.Node oldChild)
                                       throws org.w3c.dom.DOMException

      Remove the child node indicated by `oldChild` from the list of children, and returns it. DOM method: always fails.
      Specified by:
        `removeChild` in interface `org.w3c.dom.Node`
      Parameters:
        `oldChild` - The node being removed.
      Returns:
        The node removed.
      Throws:
        `org.w3c.dom.DOMException` - NO_MODIFICATION_ALLOWED_ERR: Always raised.

    - #### appendChild

          public org.w3c.dom.Node appendChild(org.w3c.dom.Node newChild)
                                       throws org.w3c.dom.DOMException

      Adds the node `newChild` to the end of the list of children of this node. DOM method: always fails.
      Specified by:
        `appendChild` in interface `org.w3c.dom.Node`
      Parameters:
        `newChild` - The node to add.
      Returns:
        The node added.
      Throws:
        `org.w3c.dom.DOMException` -
        NO_MODIFICATION_ALLOWED_ERR: Always raised.

    - #### cloneNode

          public org.w3c.dom.Node cloneNode(boolean deep)

      Returns a duplicate of this node, i.e., serves as a generic copy constructor for nodes. The duplicate node has no parent. Not implemented: always returns null. (Because trees are read-only, there would be no way of using the resulting node.)
      Specified by:
        `cloneNode` in interface `org.w3c.dom.Node`
      Parameters:
        `deep` - If `true` , recursively clone the subtree under the specified node; if `false` , clone only the node itself (and its attributes, if it is an `Element` ).
      Returns:
        The duplicate node.

    - #### normalize

          public void normalize()

      Puts all `Text` nodes in the full depth of the sub-tree underneath this `Node`, including attribute nodes, into a "normal" form where only structure (e.g., elements, comments, processing instructions, CDATA sections, and entity references) separates `Text` nodes, i.e., there are neither adjacent `Text` nodes nor empty `Text` nodes.
      Specified by:
        `normalize` in interface `org.w3c.dom.Node`
      Since:
        DOM Level 2

    - #### isSupported

          public boolean isSupported(java.lang.String feature,
                            java.lang.String version)

      Tests whether the DOM implementation implements a specific feature and that feature is supported by this node.
      Specified by:
        `isSupported` in interface `org.w3c.dom.Node`
      Parameters:
        `feature` - The name of the feature to test. This is the same name which can be passed to the method `hasFeature` on `DOMImplementation` .
        `version` - This is the version number of the feature to test. In Level 2, version 1, this is the string "2.0". If the version is not specified, supporting any version of the feature will cause the method to return `true` .
      Returns:
        Returns `true` if the specified feature is supported on this node, `false` otherwise.
      Since:
        DOM Level 2

    - #### supports

          public boolean supports(java.lang.String feature,
                         java.lang.String version)

      Alternative to isSupported(), defined in a draft DOM spec

    - #### getNamespaceURI

          public java.lang.String getNamespaceURI()

      The namespace URI of this node, or `null` if it is unspecified. DOM method.
      This is not a computed value that is the result of a namespace lookup based on an examination of the namespace declarations in scope. It is merely the namespace URI given at creation time.
      For nodes of any type other than `ELEMENT_NODE` and `ATTRIBUTE_NODE` and nodes created with a DOM Level 1 method, such as `createElement` from the `Document` interface, this is always `null` . Per the Namespaces in XML Specification an attribute does not inherit its namespace from the element it is attached to. If an attribute is not explicitly given a namespace, it simply has no namespace.
      Specified by:
        `getNamespaceURI` in interface `org.w3c.dom.Node`
      Since:
        DOM Level 2

    - #### setPrefix

          public void setPrefix(java.lang.String prefix)
                         throws org.w3c.dom.DOMException

      Set the namespace prefix of this node. Always fails.
      Specified by:
        `setPrefix` in interface `org.w3c.dom.Node`
      Throws:
        `org.w3c.dom.DOMException`

    - #### disallowUpdate

          protected void disallowUpdate()
                                 throws org.w3c.dom.DOMException

      Internal method used to indicate that update operations are not allowed
      Throws:
        `org.w3c.dom.DOMException`

    - #### getDoctype

          public org.w3c.dom.DocumentType getDoctype()

      Get the Document Type Declaration (see `DocumentType` ) associated with this document. For HTML documents as well as XML documents without a document type declaration this returns `null`. DOM method.
      Returns:
        null: The Saxon tree model does not include the document type information.

    - #### getImplementation

          public org.w3c.dom.DOMImplementation getImplementation()

      Get a `DOMImplementation` object that handles this document. A DOM application may use objects from multiple implementations. DOM method.

    - #### createElement

          public org.w3c.dom.Element createElement(java.lang.String tagName)
                                            throws org.w3c.dom.DOMException

      Creates an element of the type specified. DOM method: always fails, because the Saxon tree is not updateable.
      Throws:
        `org.w3c.dom.DOMException`

    - #### createDocumentFragment

          public org.w3c.dom.DocumentFragment createDocumentFragment()

      Creates an empty `DocumentFragment` object.
      Returns:
        A new `DocumentFragment` . DOM method: returns null, because the Saxon tree is not updateable.

    - #### createTextNode

          public org.w3c.dom.Text createTextNode(java.lang.String data)

      Create a `Text` node given the specified string. DOM method: returns null, because the Saxon tree is not updateable.
      Parameters:
        `data` - The data for the node.
      Returns:
        The new `Text` object.

    - #### createComment

          public org.w3c.dom.Comment createComment(java.lang.String data)

      Create a `Comment` node given the specified string. DOM method: returns null, because the Saxon tree is not updateable.
      Parameters:
        `data` - The data for the node.
      Returns:
        The new `Comment` object.

    - #### createCDATASection

          public org.w3c.dom.CDATASection createCDATASection(java.lang.String data)
                                                      throws org.w3c.dom.DOMException

      Create a `CDATASection` node whose value is the specified string. DOM method: always fails, because the Saxon tree is not updateable.
      Parameters:
        `data` - The data for the `CDATASection` contents.
      Returns:
        The new `CDATASection` object.
      Throws:
        `org.w3c.dom.DOMException` - NOT_SUPPORTED_ERR: Raised if this document is an HTML document.

    - #### createProcessingInstruction

          public org.w3c.dom.ProcessingInstruction createProcessingInstruction(java.lang.String target,
                                                                      java.lang.String data)
                                                                        throws org.w3c.dom.DOMException

      Create a `ProcessingInstruction` node given the specified name and data strings. DOM method: returns null, because the Saxon tree is not updateable.
      Parameters:
        `target` - The target part of the processing instruction.
        `data` - The data for the node.
      Returns:
        The new `ProcessingInstruction` object.
      Throws:
        `org.w3c.dom.DOMException` - INVALID_CHARACTER_ERR: Raised if the specified target contains an illegal character.
        NOT_SUPPORTED_ERR: Raised if this document is an HTML document.

    - #### createAttribute

          public org.w3c.dom.Attr createAttribute(java.lang.String name)
                                           throws org.w3c.dom.DOMException

      Create an `Attr` of the given name. DOM method: always fails, because the Saxon tree is not updateable.
      Parameters:
        `name` - The name of the attribute.
      Returns:
        A new `Attr` object with the `nodeName` attribute set to `name` , and `localName` , `prefix` , and `namespaceURI` set to `null` .
      Throws:
        `org.w3c.dom.DOMException` - INVALID_CHARACTER_ERR: Raised if the specified name contains an illegal character.

    - #### createEntityReference

          public org.w3c.dom.EntityReference createEntityReference(java.lang.String name)
                                                            throws org.w3c.dom.DOMException

      Create an `EntityReference` object. DOM method: returns null, because the Saxon tree is not updateable.
      Parameters:
        `name` - The name of the entity to reference.
      Returns:
        The new `EntityReference` object.
      Throws:
        `org.w3c.dom.DOMException` - INVALID_CHARACTER_ERR: Raised if the specified name contains an illegal character.
        NOT_SUPPORTED_ERR: Raised if this document is an HTML document.

    - #### getElementsByTagName

          public org.w3c.dom.NodeList getElementsByTagName(java.lang.String tagname)

      Return a `NodeList` of all the `Elements` with a given tag name in the order in which they are encountered in a preorder traversal of the `Document` tree.
      Parameters:
        `tagname` - The name of the tag to match on. The special value "*" matches all tags.
      Returns:
        A new `NodeList` object containing all the matched `Elements` .

    - #### importNode

          public org.w3c.dom.Node importNode(org.w3c.dom.Node importedNode,
                                    boolean deep)
                                      throws org.w3c.dom.DOMException

      Import a node from another document to this document. DOM method: always fails, because the Saxon tree is not updateable.
      Throws:
        `org.w3c.dom.DOMException`
      Since:
        DOM Level 2

    - #### createElementNS

          public org.w3c.dom.Element createElementNS(java.lang.String namespaceURI,
                                            java.lang.String qualifiedName)
                                              throws org.w3c.dom.DOMException

      Create an element of the given qualified name and namespace URI. HTML-only DOM implementations do not need to implement this method. DOM method: always fails, because the Saxon tree is not updateable.
      Parameters:
        `namespaceURI` - The namespace URI of the element to create.
        `qualifiedName` - The qualified name of the element type to instantiate.
      Returns:
        A new `Element` object
      Throws:
        `org.w3c.dom.DOMException`

    - #### createAttributeNS

          public org.w3c.dom.Attr createAttributeNS(java.lang.String namespaceURI,
                                           java.lang.String qualifiedName)
                                             throws org.w3c.dom.DOMException

      Create an attribute of the given qualified name and namespace URI. HTML-only DOM implementations do not need to implement this method. DOM method: returns null, because the Saxon tree is not updateable.
      Parameters:
        `namespaceURI` - The namespace URI of the attribute to create.
        `qualifiedName` - The qualified name of the attribute to instantiate.
      Returns:
        A new `Attr` object.
      Throws:
        `org.w3c.dom.DOMException`

    - #### getElementsByTagNameNS

          public org.w3c.dom.NodeList getElementsByTagNameNS(java.lang.String namespaceURI,
                                                    java.lang.String localName)

      Return a `NodeList` of all the `Elements` with a given local name and namespace URI in the order in which they are encountered in a preorder traversal of the `Document` tree. DOM method.
      Parameters:
        `namespaceURI` - The namespace URI of the elements to match on. The special value "*" matches all namespaces.
        `localName` - The local name of the elements to match on. The special value "*" matches all local names.
      Returns:
        A new `NodeList` object containing all the matched `Elements` .
      Since:
        DOM Level 2

    - #### getElementById

          public org.w3c.dom.Element getElementById(java.lang.String elementId)

      Return the `Element` whose `ID` is given by `elementId` . If no such element exists, returns `null` . Behavior is not defined if more than one element has this `ID` . The DOM implementation must have information that says which attributes are of type ID. Attributes with the name "ID" are not of type ID unless so defined. Implementations that do not know whether attributes are of type ID or not are expected to return `null` .
      Parameters:
        `elementId` - The unique `id` value for an element.
      Returns:
        The matching element, or null if there is none.
      Since:
        DOM Level 2

    - #### getTagName

          public java.lang.String getTagName()

      The name of the element (DOM interface).

    - #### getAttribute

          public java.lang.String getAttribute(java.lang.String name)

      Retrieves an attribute value by name. Namespace declarations will not be retrieved. DOM interface.
      Parameters:
        `name` - The QName of the attribute to retrieve.
      Returns:
        The `Attr` value as a string, or the empty string if that attribute does not have a specified or default value.

    - #### getAttributeNode

          public org.w3c.dom.Attr getAttributeNode(java.lang.String name)

      Retrieves an attribute node by name. Namespace declarations will not be retrieved.
      To retrieve an attribute node by qualified name and namespace URI, use the `getAttributeNodeNS` method.
      Parameters:
        `name` - The name (`nodeName` ) of the attribute to retrieve.
      Returns:
        The `Attr` node with the specified name ( `nodeName` ) or `null` if there is no such attribute.

    - #### setAttributeNode

          public org.w3c.dom.Attr setAttributeNode(org.w3c.dom.Attr newAttr)
                                            throws org.w3c.dom.DOMException

      Adds a new attribute node. Always fails
      Throws:
        `org.w3c.dom.DOMException` - NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.

    - #### removeAttribute

          public void removeAttribute(java.lang.String oldAttr)
                               throws org.w3c.dom.DOMException

      Removes the specified attribute. Always fails
      Throws:
        `org.w3c.dom.DOMException` - NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.

    - #### removeAttributeNode

          public org.w3c.dom.Attr removeAttributeNode(org.w3c.dom.Attr oldAttr)
                                               throws org.w3c.dom.DOMException

      Removes the specified attribute node. Always fails
      Throws:
        `org.w3c.dom.DOMException` - NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.

    - #### getAttributeNS

          public java.lang.String getAttributeNS(java.lang.String namespaceURI,
                                        java.lang.String localName)

      Retrieves an attribute value by local name and namespace URI. HTML-only DOM implementations do not need to implement this method.
      Parameters:
        `namespaceURI` - The namespace URI of the attribute to retrieve.
        `localName` - The local name of the attribute to retrieve.
      Returns:
        The `Attr` value as a string, or the empty string if that attribute does not have a specified or default value.
      Since:
        DOM Level 2

    - #### setAttributeNS

          public void setAttributeNS(java.lang.String namespaceURI,
                            java.lang.String qualifiedName,
                            java.lang.String value)
                              throws org.w3c.dom.DOMException

      Adds a new attribute. Always fails.
      Parameters:
        `namespaceURI` - The namespace URI of the attribute to create or alter.
        `qualifiedName` - The qualified name of the attribute to create or alter.
        `value` - The value to set in string form.
      Throws:
        `org.w3c.dom.DOMException` - NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.

    - #### removeAttributeNS

          public void removeAttributeNS(java.lang.String namespaceURI,
                               java.lang.String localName)
                                 throws org.w3c.dom.DOMException

      Removes an attribute by local name and namespace URI. Always fails
      Throws:
        `org.w3c.dom.DOMException` - NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
      Since:
        DOM Level 2

    - #### getAttributeNodeNS

          public org.w3c.dom.Attr getAttributeNodeNS(java.lang.String namespaceURI,
                                            java.lang.String localName)

      Retrieves an `Attr` node by local name and namespace URI. DOM method, so namespace declarations count as attributes.
      Parameters:
        `namespaceURI` - The namespace URI of the attribute to retrieve.
        `localName` - The local name of the attribute to retrieve.
      Returns:
        The `Attr` node with the specified attribute local name and namespace URI or `null` if there is no such attribute.
      Since:
        DOM Level 2

    - #### setAttributeNodeNS

          public org.w3c.dom.Attr setAttributeNodeNS(org.w3c.dom.Attr newAttr)
                                              throws org.w3c.dom.DOMException

      Add a new attribute. Always fails.
      Parameters:
        `newAttr` - The `Attr` node to add to the attribute list.
      Returns:
        If the `newAttr` attribute replaces an existing attribute with the same local name and namespace URI , the replaced `Attr` node is returned, otherwise `null` is returned.
      Throws:
        `org.w3c.dom.DOMException` -
        NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
      Since:
        DOM Level 2

    - #### hasAttribute

          public boolean hasAttribute(java.lang.String name)

      Returns `true` when an attribute with a given name is specified on this element or has a default value, `false` otherwise. Namespace declarations will not be retrieved.
      Parameters:
        `name` - The name of the attribute to look for.
      Returns:
        `true` if an attribute with the given name is specified on this element or has a default value, `false` otherwise.
      Since:
        DOM Level 2

    - #### hasAttributeNS

          public boolean hasAttributeNS(java.lang.String namespaceURI,
                               java.lang.String localName)

      Returns `true` when an attribute with a given local name and namespace URI is specified on this element or has a default value, `false` otherwise. Namespace declarations will not be retrieved.
      Parameters:
        `namespaceURI` - The namespace URI of the attribute to look for.
        `localName` - The local name of the attribute to look for.
      Returns:
        `true` if an attribute with the given local name and namespace URI is specified or has a default value on this element, `false` otherwise.
      Since:
        DOM Level 2

    - #### getData

          public java.lang.String getData()

      Get the character data of a Text or Comment node. DOM method.

    - #### setData

          public void setData(java.lang.String data)
                       throws org.w3c.dom.DOMException

      Set the character data of a Text or Comment node. DOM method: always fails, Saxon tree is immutable.
      Throws:
        `org.w3c.dom.DOMException`

    - #### getLength

          public int getLength()

      Get the length of a Text or Comment node. DOM method.

    - #### substringData

          public java.lang.String substringData(int offset,
                                       int count)
                                         throws org.w3c.dom.DOMException

      Extract a range of data from a Text or Comment node. DOM method.
      Parameters:
        `offset` - Start offset of substring to extract.
        `count` - The number of 16-bit units to extract.
      Returns:
        The specified substring. If the sum of `offset` and `count` exceeds the `length` , then all 16-bit units to the end of the data are returned.
      Throws:
        `org.w3c.dom.DOMException` - INDEX_SIZE_ERR: Raised if the specified `offset` is negative or greater than the number of 16-bit units in `data` , or if the specified `count` is negative.

    - #### appendData

          public void appendData(java.lang.String arg)
                          throws org.w3c.dom.DOMException

      Append the string to the end of the character data of the node. DOM method: always fails.
      Parameters:
        `arg` - The `DOMString` to append.
      Throws:
        `org.w3c.dom.DOMException` - NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.

    - #### insertData

          public void insertData(int offset,
                        java.lang.String arg)
                          throws org.w3c.dom.DOMException

      Insert a string at the specified character offset. DOM method: always fails.
      Parameters:
        `offset` - The character offset at which to insert.
        `arg` - The `DOMString` to insert.
      Throws:
        `org.w3c.dom.DOMException`

    - #### deleteData

          public void deleteData(int offset,
                        int count)
                          throws org.w3c.dom.DOMException

      Remove a range of 16-bit units from the node. DOM method: always fails.
      Parameters:
        `offset` - The offset from which to start removing.
        `count` - The number of 16-bit units to delete.
      Throws:
        `org.w3c.dom.DOMException`

    - #### replaceData

          public void replaceData(int offset,
                         int count,
                         java.lang.String arg)
                           throws org.w3c.dom.DOMException

      Replace the characters starting at the specified 16-bit unit offset with the specified string. DOM method: always fails.
      Parameters:
        `offset` - The offset from which to start replacing.
        `count` - The number of 16-bit units to replace.
        `arg` - The `DOMString` with which the range must be replaced.
      Throws:
        `org.w3c.dom.DOMException` - NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.

    - #### splitText

          public org.w3c.dom.Text splitText(int offset)
                                     throws org.w3c.dom.DOMException

      Break this node into two nodes at the specified offset, keeping both in the tree as siblings. DOM method, always fails.
      Parameters:
        `offset` - The 16-bit unit offset at which to split, starting from 0.
      Returns:
        The new node, of the same type as this node.
      Throws:
        `org.w3c.dom.DOMException`

    - #### getName

          public java.lang.String getName()

      Get the name of an attribute node (the QName) (DOM method)

    - #### getValue

          public java.lang.String getValue()

      Return the character value of an attribute node (DOM method)
      Returns:
        the attribute value

    - #### getSpecified

          public boolean getSpecified()

      If this attribute was explicitly given a value in the original document, this is `true` ; otherwise, it is `false`. (DOM method)
      Returns:
        Always true in this implementation.

    - #### setValue

          public void setValue(java.lang.String value)
                        throws org.w3c.dom.DOMException

      Set the value of an attribute node. (DOM method). Always fails (because tree is readonly)
      Throws:
        `org.w3c.dom.DOMException`

    - #### getOwnerElement

          public org.w3c.dom.Element getOwnerElement()

      The `Element` node this attribute is attached to or `null` if this attribute is not in use.
      Since:
        DOM Level 2

    - #### getSchemaTypeInfo

          public TypeInfo getSchemaTypeInfo()

      The type information associated with this attribute. While the type information contained in this attribute is guarantee to be correct after loading the document or invoking `Document.normalizeDocument()`, `schemaTypeInfo` may not be reliable if the node was moved.

      This implementation always returns null;

      Since:
        DOM Level 3

    - #### isId

          public boolean isId()

      Returns whether this attribute is known to be of type ID (i.e. to contain an identifier for its owner element) or not.

      This implementation always returns false.

      Since:
        DOM Level 3

    - #### compareDocumentPosition

          public short compareDocumentPosition(org.w3c.dom.Node other)
                                        throws org.w3c.dom.DOMException

      Compares the reference node, i.e. the node on which this method is being called, with a node, i.e. the one passed as a parameter, with regard to their position in the document and according to the document order.
      Specified by:
        `compareDocumentPosition` in interface `org.w3c.dom.Node`
      Parameters:
        `other` - The node to compare against the reference node.
      Returns:
        Returns how the node is positioned relatively to the reference node.
      Throws:
        `org.w3c.dom.DOMException` - NOT_SUPPORTED_ERR: when the compared nodes are from different DOM implementations that do not coordinate to return consistent implementation-specific results.
      Since:
        DOM Level 3

    - #### getFeature

          public java.lang.Object getFeature(java.lang.String feature,
                                    java.lang.String version)

      This method returns a specialized object which implements the specialized APIs of the specified feature and version, as specified in . The specialized object may also be obtained by using binding-specific casting methods but is not necessarily expected to, as discussed in . This method also allow the implementation to provide specialized objects which do not support the `Node` interface.
      Specified by:
        `getFeature` in interface `org.w3c.dom.Node`
      Parameters:
        `feature` - The name of the feature requested. Note that any plus sign "+" prepended to the name of the feature will be ignored since it is not significant in the context of this method.
        `version` - This is the version number of the feature to test.
      Returns:
        Returns an object which implements the specialized APIs of the specified feature and version, if any, or `null` if there is no object which implements interfaces associated with that feature. If the `DOMObject` returned by this method implements the `Node` interface, it must delegate to the primary core `Node` and not return results inconsistent with the primary core `Node` such as attributes, childNodes, etc.

        The Saxon implementation of this method always returns null

      Since:
        DOM Level 3

    - #### getTextContent

          public java.lang.String getTextContent()
                                          throws org.w3c.dom.DOMException

      This attribute returns the text content of this node and its descendants. When it is defined to be `null`, setting it has no effect. On setting, any possible children this node may have are removed and, if it the new string is not empty or `null`, replaced by a single `Text` node containing the string this attribute is set to.
      On getting, no serialization is performed, the returned string does not contain any markup. No whitespace normalization is performed and the returned string does not contain the white spaces in element content (see the attribute `Text.isElementContentWhitespace`). Similarly, on setting, no parsing is performed either, the input string is taken as pure textual content.
      The string returned is made of the text content of this node depending on its type, as defined below:

      Node type | Content
      --- | ---
      ELEMENT_NODE, ATTRIBUTE_NODE, ENTITY_NODE, ENTITY_REFERENCE_NODE, DOCUMENT_FRAGMENT_NODE | concatenation of the `textContent` attribute value of every child node, excluding COMMENT_NODE and PROCESSING_INSTRUCTION_NODE nodes. This is the empty string if the node has no children.
      TEXT_NODE, CDATA_SECTION_NODE, COMMENT_NODE, PROCESSING_INSTRUCTION_NODE | `nodeValue`
      DOCUMENT_NODE, DOCUMENT_TYPE_NODE, NOTATION_NODE | null

      The Saxon implementation returns the same result as getStringValue()

      Specified by:
        `getTextContent` in interface `org.w3c.dom.Node`
      Throws:
        `org.w3c.dom.DOMException` - DOMSTRING_SIZE_ERR: Raised when it would return more characters than fit in a `DOMString` variable on the implementation platform.
      Since:
        DOM Level 3

    - #### getUserData

          public java.lang.Object getUserData(java.lang.String key)

      Retrieves the object associated to a key on a this node. The object must first have been set to this node by calling `setUserData` with the same key.

      The Saxon implementation always returns null.

      Specified by:
        `getUserData` in interface `org.w3c.dom.Node`
      Parameters:
        `key` - The key the object is associated to.
      Returns:
        Returns the `DOMUserData` associated to the given key on this node, or `null` if there was none.
      Since:
        DOM Level 3

    - #### isDefaultNamespace

          public boolean isDefaultNamespace(java.lang.String namespaceURI)

      This method checks if the specified `namespaceURI` is the default namespace or not.
      Specified by:
        `isDefaultNamespace` in interface `org.w3c.dom.Node`
      Parameters:
        `namespaceURI` - The namespace URI to look for.
      Returns:
        Returns `true` if the specified `namespaceURI` is the default namespace, `false` otherwise.
      Since:
        DOM Level 3

    - #### isEqualNode

          public boolean isEqualNode(org.w3c.dom.Node arg)

      Tests whether two nodes are equal.
      This method tests for equality of nodes, not sameness (i.e., whether the two nodes are references to the same object) which can be tested with `Node.isSameNode()`. All nodes that are the same will also be equal, though the reverse may not be true.
      Two nodes are equal if and only if the following conditions are satisfied:
      - The two nodes are of the same type.
      - The following string attributes are equal: `nodeName`, `localName`, `namespaceURI`, `prefix`, `nodeValue` . This is: they are both `null`, or they have the same length and are character for character identical.
      - The `attributes` `NamedNodeMaps` are equal. This is: they are both `null`, or they have the same length and for each node that exists in one map there is a node that exists in the other map and is equal, although not necessarily at the same index.
      - The `childNodes` `NodeLists` are equal. This is: they are both `null`, or they have the same length and contain equal nodes at the same index. Note that normalization can affect equality; to avoid this, nodes should be normalized before being compared.
      For two `DocumentType` nodes to be equal, the following conditions must also be satisfied:
      - The following string attributes are equal: `publicId`, `systemId`, `internalSubset`.
      - The `entities` `NamedNodeMaps` are equal.
      - The `notations` `NamedNodeMaps` are equal.
      On the other hand, the following do not affect equality: the `ownerDocument`, `baseURI`, and `parentNode` attributes, the `specified` attribute for `Attr` nodes, the `schemaTypeInfo` attribute for `Attr` and `Element` nodes, the `Text.isElementContentWhitespace` attribute for `Text` nodes, as well as any user data or event listeners registered on the nodes.

      Note: As a general rule, anything not mentioned in the description above is not significant in consideration of equality checking. Note that future versions of this specification may take into account more attributes and implementations conform to this specification are expected to be updated accordingly.

      Specified by:
        `isEqualNode` in interface `org.w3c.dom.Node`
      Parameters:
        `arg` - The node to compare equality with.
      Returns:
        Returns `true` if the nodes are equal, `false` otherwise.
      Since:
        DOM Level 3

    - #### isSameNode

          public boolean isSameNode(org.w3c.dom.Node other)

      Returns whether this node is the same node as the given one.
      This method provides a way to determine whether two `Node` references returned by the implementation reference the same object. When two `Node` references are references to the same object, even if through a proxy, the references may be used completely interchangeably, such that all attributes have the same values and calling the same DOM method on either reference always has exactly the same effect.
      Specified by:
        `isSameNode` in interface `org.w3c.dom.Node`
      Parameters:
        `other` - The node to test against.
      Returns:
        Returns `true` if the nodes are the same, `false` otherwise.
      Since:
        DOM Level 3

    - #### lookupNamespaceURI

          public java.lang.String lookupNamespaceURI(java.lang.String prefix)

      Look up the namespace URI associated to the given prefix, starting from this node.
      See for details on the algorithm used by this method.
      Specified by:
        `lookupNamespaceURI` in interface `org.w3c.dom.Node`
      Parameters:
        `prefix` - The prefix to look for. If this parameter is `null`, the method will return the default namespace URI if any.
      Returns:
        Returns the associated namespace URI or `null` if none is found.
      Since:
        DOM Level 3

    - #### lookupPrefix

          public java.lang.String lookupPrefix(java.lang.String namespaceURI)

      Look up the prefix associated to the given namespace URI, starting from this node. The default namespace declarations are ignored by this method.
      See for details on the algorithm used by this method.
      Specified by:
        `lookupPrefix` in interface `org.w3c.dom.Node`
      Parameters:
        `namespaceURI` - The namespace URI to look for.
      Returns:
        Returns an associated namespace prefix if found or `null` if none is found. If more than one prefix are associated to the namespace prefix, the returned namespace prefix is implementation dependent.
      Since:
        DOM Level 3

    - #### setTextContent

          public void setTextContent(java.lang.String textContent)
                              throws org.w3c.dom.DOMException

      This attribute returns the text content of this node and its descendants. When it is defined to be `null`, setting it has no effect. On setting, any possible children this node may have are removed and, if it the new string is not empty or `null`, replaced by a single `Text` node containing the string this attribute is set to.
      On getting, no serialization is performed, the returned string does not contain any markup. No whitespace normalization is performed and the returned string does not contain the white spaces in element content (see the attribute `Text.isElementContentWhitespace`). Similarly, on setting, no parsing is performed either, the input string is taken as pure textual content.
      The string returned is made of the text content of this node depending on its type, as defined below:

      Node type | Content
      --- | ---
      ELEMENT_NODE, ATTRIBUTE_NODE, ENTITY_NODE, ENTITY_REFERENCE_NODE, DOCUMENT_FRAGMENT_NODE | concatenation of the `textContent` attribute value of every child node, excluding COMMENT_NODE and PROCESSING_INSTRUCTION_NODE nodes. This is the empty string if the node has no children.
      TEXT_NODE, CDATA_SECTION_NODE, COMMENT_NODE, PROCESSING_INSTRUCTION_NODE | `nodeValue`
      DOCUMENT_NODE, DOCUMENT_TYPE_NODE, NOTATION_NODE | null

      Specified by:
        `setTextContent` in interface `org.w3c.dom.Node`
      Throws:
        `org.w3c.dom.DOMException` - NO_MODIFICATION_ALLOWED_ERR: Raised when the node is readonly.
      Since:
        DOM Level 3

    - #### setUserData

          public java.lang.Object setUserData(java.lang.String key,
                                     java.lang.Object data,
                                     UserDataHandler handler)

      Associate an object to a key on this node. The object can later be retrieved from this node by calling `getUserData` with the same key.
      Specified by:
        `setUserData` in interface `org.w3c.dom.Node`
      Parameters:
        `key` - The key to associate the object to.
        `data` - The object to associate to the given key, or `null` to remove any existing association to that key.
        `handler` - The handler to associate to that key, or `null`.
      Returns:
        Returns the `DOMUserData` previously associated to the given key on this node, or `null` if there was none.
      Since:
        DOM Level 3

    - #### getWholeText

          public java.lang.String getWholeText()

      Returns all text of `Text` nodes logically-adjacent text nodes to this node, concatenated in document order.
      For instance, in the example below `wholeText` on the `Text` node that contains "bar" returns "barfoo", while on the `Text` node that contains "foo" it returns "barfoo".
      Since:
        DOM Level 3

    - #### isElementContentWhitespace

          public boolean isElementContentWhitespace()

      Returns whether this text node contains element content whitespace, often abusively called "ignorable whitespace". The text node is determined to contain whitespace in element content during the load of the document or if validation occurs while using `Document.normalizeDocument()`.

      The Saxon implementation always returns false.

      Since:
        DOM Level 3

    - #### replaceWholeText

          public org.w3c.dom.Text replaceWholeText(java.lang.String content)
                                            throws org.w3c.dom.DOMException

      Replaces the text of the current node and all logically-adjacent text nodes with the specified text. All logically-adjacent text nodes are removed including the current node unless it was the recipient of the replacement text.
      This method returns the node which received the replacement text. The returned node is:
      - `null`, when the replacement text is the empty string;
      - the current node, except when the current node is read-only;
      - a new `Text` node of the same type ( `Text` or `CDATASection`) as the current node inserted at the location of the replacement.
      For instance, in the above example calling `replaceWholeText` on the `Text` node that contains "bar" with "yo" in argument results in the following:
      Where the nodes to be removed are read-only descendants of an `EntityReference`, the `EntityReference` must be removed instead of the read-only nodes. If any `EntityReference` to be removed has descendants that are not `EntityReference`, `Text`, or `CDATASection` nodes, the `replaceWholeText` method must fail before performing any modification of the document, raising a `DOMException` with the code `NO_MODIFICATION_ALLOWED_ERR`.
      For instance, in the example below calling `replaceWholeText` on the `Text` node that contains "bar" fails, because the `EntityReference` node "ent" contains an `Element` node which cannot be removed.
      Parameters:
        `content` - The content of the replacing `Text` node.
      Returns:
        The `Text` node created with the specified content.
      Throws:
        `org.w3c.dom.DOMException` - NO_MODIFICATION_ALLOWED_ERR: Raised if one of the `Text` nodes being replaced is readonly.
      Since:
        DOM Level 3

    - #### setIdAttribute

          public void setIdAttribute(java.lang.String name,
                            boolean isId)
                              throws org.w3c.dom.DOMException

      If the parameter `isId` is `true`, this method declares the specified attribute to be a user-determined ID attribute . This affects the value of `Attr.isId` and the behavior of `Document.getElementById`, but does not change any schema that may be in use, in particular this does not affect the `Attr.schemaTypeInfo` of the specified `Attr` node. Use the value `false` for the parameter `isId` to undeclare an attribute for being a user-determined ID attribute.
      To specify an attribute by local name and namespace URI, use the `setIdAttributeNS` method.
      Parameters:
        `name` - The name of the attribute.
        `isId` - Whether the attribute is a of type ID.
      Throws:
        `org.w3c.dom.DOMException` - NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
        NOT_FOUND_ERR: Raised if the specified node is not an attribute of this element.
      Since:
        DOM Level 3

    - #### setIdAttributeNode

          public void setIdAttributeNode(org.w3c.dom.Attr idAttr,
                                boolean isId)
                                  throws org.w3c.dom.DOMException

      If the parameter `isId` is `true`, this method declares the specified attribute to be a user-determined ID attribute . This affects the value of `Attr.isId` and the behavior of `Document.getElementById`, but does not change any schema that may be in use, in particular this does not affect the `Attr.schemaTypeInfo` of the specified `Attr` node. Use the value `false` for the parameter `isId` to undeclare an attribute for being a user-determined ID attribute.
      Parameters:
        `idAttr` - The attribute node.
        `isId` - Whether the attribute is a of type ID.
      Throws:
        `org.w3c.dom.DOMException` - NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
        NOT_FOUND_ERR: Raised if the specified node is not an attribute of this element.
      Since:
        DOM Level 3

    - #### setIdAttributeNS

          public void setIdAttributeNS(java.lang.String namespaceURI,
                              java.lang.String localName,
                              boolean isId)
                                throws org.w3c.dom.DOMException

      If the parameter `isId` is `true`, this method declares the specified attribute to be a user-determined ID attribute . This affects the value of `Attr.isId` and the behavior of `Document.getElementById`, but does not change any schema that may be in use, in particular this does not affect the `Attr.schemaTypeInfo` of the specified `Attr` node. Use the value `false` for the parameter `isId` to undeclare an attribute for being a user-determined ID attribute.
      Parameters:
        `namespaceURI` - The namespace URI of the attribute.
        `localName` - The local name of the attribute.
        `isId` - Whether the attribute is a of type ID.
      Throws:
        `org.w3c.dom.DOMException` - NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
        NOT_FOUND_ERR: Raised if the specified node is not an attribute of this element.
      Since:
        DOM Level 3