[DB2LaTeX-apps] problem with ampersands in ulinks 'url' attribute

Hello,

I am trying to convert a docbook Article to pdf using the program 'xmlto'.
I get a LaTeX error for a document with a ulink element containing the
entity reference "&".

Is there a way around this problem?


Here is the document:
-------------------------------------------
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
"http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd">
<article>
  <title>Title</title>

  <para><ulink url="http://x.y?a&amp;b">ulink with ampersand</ulink></para>
</article>
-------------------------------------------


Thanks in advance
/Emil Karlén