LEVEL
	warning
	alert
	critical
	emergency
 
 [waring] Fix bug in evaluation in axis, following-sibling and preceding-sibling.
 		attribute and namespace node can't have these.
 
 [alert] for SELECT DISTINCT, ORDER BY expressions must appear in target list.
 
		xpsql=# select toXML(id) from xpath_eval('//base/descendant::*',1);
		ERROR:  for SELECT DISTINCT, ORDER BY expressions must appear in target list
 
 [warning] toXML function tends to causes same result in this case. need fix.

		select toxml(id) from xpath_eval('//base/attribute::node()');
		select toxml(id) from xpath_eval('//base/namespace::node()');
		 
 
 