Ignoring NonDocBook tags, take 2

A set of non-DocBook XML tags are nested in my DocBook article.

I am trying to modify the stylesheet with no success.

What is the proper method to completely ignore a set of tags such as
<a  attrib=test1>, </a>
<b attrib=test2>, </b>

but keep any text & valid DocBook tags with may be interspersed among 
these nonDocBook tags?

Cheers,

Tristan
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Tristan J. Fiedler
Postdoctoral Fellow - Stein Lab
Cold Spring Harbor Laboratory