dtdValidElement {XML}R Documentation

Determines whether an XML tag is valid within another.


This tests whether name is a legitimate tag to use as a direct sub-element of the within tag according to the definition of the within element in the specified DTD.


dtdValidElement(name, within, dtd, pos=NULL)


name The name of the tag which is to be inserted inside the within tag.
within The name of the parent tag the definition of which we are checking to determine if it contains name.
dtd The DTD in which the elements name and within are defined.
pos An optional position at which we might add the name element inside within. If this is specified, we have a stricter test that accounds for sequences in which elements must appear in order. These are comma-separated entries in the element definition.


Returns a logical value. TRUE indicates that a name element can be used inside a within element. FALSE indicates that it cannot.


Duncan Temple Lang


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

See Also

parseDTD, dtdElement, dtdElementValidEntry,


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

  # The following are true.
 dtdValidElement("variable","variables", dtd = foo.dtd)
 dtdValidElement("record","dataset", dtd = foo.dtd)

  # This is false.
 dtdValidElement("variable","dataset", dtd = foo.dtd)

[Package XML version 0.97-0 Index]