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

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.

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.

References

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

Author

Duncan Temple Lang

Examples

 dtdFile <- system.file("exampleData", "foo.dtd",package="XML")
 dtd <- parseDTD(dtdFile) 
 
  dtdElementValidEntry(dtdElement("variables",dtd), "variable")
#> [1] TRUE