/* * call-seq: * create_internal_subset(name, external_id, system_id) * * Create an internal subset */ static VALUE create_internal_subset(VALUE self, VALUE name, VALUE external_id, VALUE system_id) { xmlNodePtr node; xmlDocPtr doc; Data_Get_Struct(self, xmlNode, node); doc = node->doc; if(xmlGetIntSubset(doc)) rb_raise(rb_eRuntimeError, "Document already has an internal subset"); xmlDtdPtr dtd = xmlCreateIntSubset( doc, NIL_P(name) ? NULL : (const xmlChar *)StringValuePtr(name), NIL_P(external_id) ? NULL : (const xmlChar *)StringValuePtr(external_id), NIL_P(system_id) ? NULL : (const xmlChar *)StringValuePtr(system_id) ); if(!dtd) return Qnil; return Nokogiri_wrap_xml_node(Qnil, (xmlNodePtr)dtd); }