check the attribute name of an ancestor

Hi experts,

I have the following .xsl code:
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<xsl:for-each
                select="@*[contains(local-name(),'my-' )  or  contains(local-name(),'MY-' )][not(ancestor::xxx21:Extension)]">
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for the last condition, how do I specify the Extension from certain extender "ABC"? what's the right syntax for something like:
[not(ancestor::xxx21:Extension(extender="ABC")]  ???

Thanks a lot!
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