R: Facilities for working with XML strings

isXMLString {XML} | R Documentation

## Facilities for working with XML strings

### Description

These functions and classes are used to represent and parse a string whose content is known to be XML. `xml` allows us to mark a character vector as containing XML, i.e. of class `XMLString`.

`xmlParseString` is a convenience routine for converting an XML string into an XML node/tree.

`isXMLString` is examines a strings content and heuristically determines whether it is XML.

### Usage

    isXMLString(str)
    xmlParseString(content, doc = NULL, namespaces = RXMLNamespaces,
                    clean = TRUE, addFinalizer = NA)
    xml(x)

### Arguments

`str,x,content` | the string containing the XML material.
`doc` | if specified, an `XMLInternalDocument` object which is used to "house" the new nodes. Specifically, when the nodes are created, they are made as part of this document. This may not be as relevant now with the garbage collection being done at a node and document level. But it still potentially of some value.
`namespaces` | a character vector giving the URIs for the XML namespaces which are to be removed if `clean` is `TRUE`.
`clean` | a logical value that controls whether namespaces are removed after the document is parsed..
`addFinalizer` | a logical value or identifier for a C routine that controls whether we register finalizers on the intenal node.

### Value

`isXMLString` returns a logical value.

`xmlParseString` returns an object of class `XMLInternalElementNode`.

`xml` returns an object of class `XMLString` identifying the text as `XML`.

### Author(s)

Dncan Temple Lang

### See Also

`xmlParse` `xmlTreeParse`

### Examples

     isXMLString("a regular string < 20 characters long")
     isXMLString("<a><b>c</b></a>")

     xmlParseString("<a><b>c</b></a>")

      # We can lie!
     isXMLString(xml("foo"))

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