No, xhtml died. Pages are html and not neccessary xml compatible. XPath is used for html independent of xml (because the structure is very similar and as such

No, xhtml died. Pages are html and not neccessary xml compatible. XPath is used for html independent of xml (because the structure is very similar and as such querying html with xml based query systems can work). But for google it's part of their xml code base they don't want to touch.