dtdElementValidEntry: Determines whether an XML element allows a particular type of...

In omegahat/XML: Tools for Parsing and Generating XML Within R and S-Plus

Determines whether an XML element allows a particular type of sub-element.

Description

This tests whether name is a legitimate tag to use as a direct sub-element of the element tag according to the definition of the element element in the specified DTD. This is a generic function that dispatches on the element type, so that different version take effect for XMLSequenceContent, XMLOrContent, XMLElementContent.

Usage

dtdElementValidEntry(element, name, pos=NULL)

Arguments

element	The XMLElementDef defining the tag in which we are asking whether the sub-element can be used.
name	The name of the sub-element about which we are querying the list of sub-tags within element.
pos	An optional argument which, if supplied, queries whether the name sub-element is valid as the pos-th child of element.

Details

This is not intended to be called directly, but indirectly by the dtdValidElement function.

Value

Logical value indicating whether the sub-element can appear in an element tag or not.

Author(s)

Duncan Temple Lang

References

https://www.w3.org/XML, http://www.jclark.com/xml, http://github.com/omegahat/XML

See Also

parseDTD, dtdValidElement, dtdElement

Examples

 dtdFile <- system.file("exampleData", "foo.dtd",package="XML")
 dtd <- parseDTD(dtdFile)

  dtdElementValidEntry(dtdElement("variables",dtd), "variable")

omegahat/XML documentation built on Jan. 17, 2024, 6:47 p.m.