/*
* call-seq:
* +(node_set)
*
* Concatenation - returns a new NodeSet built by concatenating the node set
* with +node_set+ to produce a third NodeSet
*/
static VALUE plus(VALUE self, VALUE rb_other)
{
xmlNodeSetPtr node_set;
xmlNodeSetPtr other;
xmlNodeSetPtr new;
if(! rb_funcall(rb_other, rb_intern("is_a?"), 1, cNokogiriXmlNodeSet))
rb_raise(rb_eArgError, "node_set must be a Nokogiri::XML::NodeSet");
Data_Get_Struct(self, xmlNodeSet, node_set);
Data_Get_Struct(rb_other, xmlNodeSet, other);
new = xmlXPathNodeSetMerge(NULL, node_set);
new = xmlXPathNodeSetMerge(new, other);
VALUE new_set = Nokogiri_wrap_xml_node_set(new);
rb_iv_set(new_set, "@document", rb_iv_get(self, "@document"));
return new_set;
}