Namespaced tag in HTML page is making Xpath parser fall over

Hi,

I'm parsing an HTML feed page with the Xpath parser. I get the error

Namespace prefix o is not defined on line 234. Error code: 201
Tag o:p invalid on line 234. Error code: 801

because in the HTML there is the tags:

<o:p></o:p>

This is making the complete parser fall over and no context is returned although it only appears once (maybe by mistake) in the complete document.

Is there anyway to either allow these namespaces or to only consider this a warning and not a fatal error so that the parser will continue?

Thanks
Rich

p.s. URL of source page on request.