/* * call-seq: * create_external_subset(name, external_id, system_id) * * Create an external subset */ static VALUE create_external_subset(VALUE self, VALUE name, VALUE external_id, VALUE system_id) { xmlNodePtr node; xmlDocPtr doc; xmlDtdPtr dtd; Data_Get_Struct(self, xmlNode, node); doc = node->doc; if(doc->extSubset) rb_raise(rb_eRuntimeError, "Document already has an external subset"); dtd = xmlNewDtd( 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); }