Use an XPath exp on the result of a previous XPath exp (Matt Gallagher functions)

I'm using the Matt Gallagher functions to parse a not well-formed html using XPath.
Is it possible to use an XPath query on the result of a previous XPath query?
I would first select all the nodes corresponding to p, h1-h6, ol, li tags and then use on them the //text() XPath expression.