xmlDocGetRootElement is available since version 1.0.
Prototype:
number xmlDocGetRootElement(number doc)
Parameters
doc
the XML document tree handle as returned by
xmlParseMemory or { xmlParseFile}
Description:
Get the root element of the document (doc->children is a list containing possibly comments, PIs, etc ...).
Return value:
Returns an XML Node handle for the root or null if failed.