[.XMLNode {XML} | R Documentation

## Convenience accessors for the children of XMLNode objects.

### Description

These provide a simplified syntax for extracting the children of an XML node.

### Usage

    obj[[i]]
    "[.XMLNode"(obj, ..., all = FALSE)
    "[[.XMLNode"(obj, ...)
    "[[.XMLDocumentContent"(obj, ...)

### Arguments

`obj` | the XML node or the top-level document content in which the children are to be accessed. The `XMLDocumentContent` is the container for the top-level node that also contains information such as the URI/filename and XML version. This accessor method is merely a convenience to get access to children of the top-level node.
`i` | index of the child of interest or the name of an XML element of interest. In this latter case, only the first matching element is returned, if any.
`...` | the identifiers for the children to be retrieved, given as integer indices, names, etc. in the usual format for the generic `link{[}` and `link{[[}` operators
`all` | logical value. When ... is a character vector, a value of `TRUE` for `all` means to retrieve all of the nodes with those names rather than just the first one. `FALSE` gives the usual result of subsetting a list by name which gives just the first element. This allows us to avoid the idiom `node[ names(node) == "bob" ]` which is complicated when node is the result of an inline computation and instead we use `node["bob", all = TRUE]`.

### Value

A list or single element containing the children of the XML node given by `obj` and identified by ....

### Author(s)

Duncan Temple Lang

### References

http://www.w3.org/XML, http://www.omegahat.org/RSXML

### See Also

`xmlAttrs` `[<-.XMLNode` `[[<-.XMLNode`

### Examples

     f = system.file("exampleData", "gnumeric.xml", package = "XML")

     top = xmlRoot(xmlTreeParse(f))

      # Get the first RowInfo element.
     top[["Sheets"]][[1]][["Rows"]][["RowInfo"]]

      # Get a list containing only the first row element
     top[["Sheets"]][[1]][["Rows"]]["RowInfo"]
     top[["Sheets"]][[1]][["Rows"]][1]

      # Get all of the RowInfo elements by position
     top[["Sheets"]][[1]][["Rows"]][1:xmlSize(top[["Sheets"]][[1]][["Rows"]])]

      # But more succinctly and accurately, get all of the RowInfo elements
     top[["Sheets"]][[1]][["Rows"]]["RowInfo", all = TRUE]

[Package XML version 1.7-1 Index]