@XMLNODES[["filename"],path] : Return the number of nodes (children) for the specified path in an XML file. The arguments are:
filename - name of XML file
path - one or more element accessors separated by a /.
If you don't specify a filename (which *must* be in double quotes), @XMLXPATH will use the XML file previously opened by @XMLOPEN.
For more details on XML support, see XML in Take Command.