YAXL gets XPath

I added some basic XPath support to YAXL this morning. It now supports both abbreviated and unabbreviated XPath queries on Element objects. Currently only attribute-value and node/node-set selections are supported. Also, only the following axes are allowed in queries: self, parent, ancestor, ancestor-or-self, child, descendant, descendant-or-self

Especially cool (IMO) is the fact that YAXL supports two methods of performing XPath queries: you can call select on an instance of Element or you can call an instance of Element and supply the XPath as the only parameter.