This function performs the substitution of the XInclude
node. It is very similar to
but is for use with XSL processing where the node may not have
a document and so would not work with
Further, here we are interested in retrieving the nodes that were
created as part of the XInclude operation so that we might use
them in another context. This differs from the common use of
processXInclude which is to do the substitution in place,
i.e. replace the XInclude node with the contents to which it refers.
an XPathNodeSet, typically passed from an XSL template rule that calls this R function
A reference to a C-level/internal XPathNodeSet object which contains the nodes that were the result of performing the XInclude substitution.
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