You have no commento nodes in your XML. Maybe that's already the whole problem?

Also, when trying XPath queries, I find it often more beneficial to use unanchored queries while trying things out. You may want to search for //comment instead of commento.

In reply to Re: How to write an xpath query including attributes for an XML with namespace by Corion
in thread How to write an xpath query including attributes for an XML with namespace by topola1882

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