DOCBOOK: Invalid references to <section> and <programlisting> in an article doctype.

[Jorge Godoy <godoy@conectiva.com.br>]

I'm writing an article where I need to make <xref>s to some sections
and programlistings. Unfortunately, jade / openjade doesn't allow that
(thought that nsgmls and onsgmls doesn't echo any error messages when
making the document validation test). Has anybody had this error
before? What was the solution for this? 

Thanks!
--
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