/*
* call-seq:
* internal_subset
*
* Get the internal subset
*/
static VALUE internal_subset(VALUE self)
{
xmlNodePtr node;
xmlDocPtr doc;
Data_Get_Struct(self, xmlNode, node);
if(!node->doc) return Qnil;
doc = node->doc;
xmlDtdPtr dtd = xmlGetIntSubset(doc);
if(!dtd) return Qnil;
return Nokogiri_wrap_xml_node(Qnil, (xmlNodePtr)dtd);
}