| dtdValidElement {XML} | R Documentation |
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. |
This applies to direct sub-elements
or children of the within tag and not tags nested
within children of that tag, i.e. descendants.
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
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)