dtdValidElement: Determines whether an XML tag is valid within another.
Description
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.
Since parseDTD no longer works, this function isn't
expected to work either and will be removed in a future version of
XML.
Usage
dtdValidElement(name, within, dtd, pos=NULL)
Value
Returns a logical value.
TRUE indicates that a name element
can be used inside a within element.
FALSE indicates that it cannot.
Arguments
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.
Author
Duncan Temple Lang
Details
This applies to direct sub-elements
or children of the within tag and not tags nested
within children of that tag, i.e. descendants.