simple XPath expression

Hi
I'm still a bit new to XSLT and I'm trying to write a certain xpath expression
without any success.

I'm processing an xhtml file (basically, it's just html really) to add some
styling (e.g. fonts etc).

Initially, I started off with a template for matching text in the html, and
the line was as follows:

  <xsl:template match="xhtml:body//text()">

This rule worked fine, and matched on text nodes in the html.

An extra requirement then came up - I wanted to change this line so that it
only matched on text nodes that didn't have a <font> element as an ancestor.
The following line is my current attempt to do this:

  <xsl:template match="xhtml:body//text()[not(ancestor::font)]">

but it doesn't work. The XSLT processor does the processing without any
errors, but it matches on lines that do have a font ancestor, so I haven't
written the line right...

can anyone suggest where I'm going wrong?

thanks!
alex

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