DOCBOOK: Using olink.dsl

I'm using olink.dsl to generate links to
external documents.

I followed 1 to 1 the instructions for using
it, but as I compile the whole with jade, I
get a number of messages like this:

jade: /docs/tech/en/glossary/tech_r03e_glossary.olink:150:10:E: end tag
for "A" omitted, but its declaration does not permit this

This message occurs because olink.dsl generates elements like
<a name="3"/> instead of <a name="3"></a> (I'm using XML docbook 4.1).

How can I make olink.dsl generating the right elements?

Thanks,
Giuseppe