Problems with including code samples using <xi:include>

Hello!

 

I have included a DocBook XML file
(encoded UTF-8) in a programlisting which in turn is placed in an example:

 

    <section xml:id="docbook">

        <title>What is
DocBook?</title>

        <para>DocBook
provides…</para>

        <para>DocBook has
some 400 tags...</para>

        <example>

            <title>A typical,
simple DocBook document</title>

            <programlisting language="xml">

  
 <xi:include href="userintroduction.xml" parse="text"><xi:fallback><phrase>userintroduction.xml
not found.</phrase><phrase userlevel="internal"> Please check
for black holes!</phrase></xi:fallback></xi:include>

</programlisting>

        
</example>

    
</section>

In the PDF output (using XEP) I have
the following two problems:

 

*Problem 1: The code lines are shown
double-spaced instead of single (empty lines between the code lines) and the
syntax highlighting does not work. Note that when copy-pasting the code into
the DocBook document, both works fine.

 

*Problem 2: I get two page breaks
which I did not bargain for. The PDF is structured as follows:

 

… blah the end of the last
section.

What is DocBook?

DocBook provides…

(half a page empty)

(page break)

DocBook has some 400 tags…

(90% of the page empty)

(page break)

Example: A typical, simple DocBook
document

…

 

I use XSLTHL for syntax
highlighting. If you need more information please tell me.

 

Thank you in advance!