DOCBOOK-APPS: I Need to insert C-language code into DocBook XML

[dbook@centrum.cz]

I have problem - how to put into DocBook XML content of file with 
C-language code? 
Problem is, that this content must be placed in external file 
(source.c), no directly in DocBook XML.

My idea was:

<!DOCTYPE book PUBLIC ...
  [<!ENTITY ccode SYSTEM "source.c">]
>
...
<programlisting>
<![CDATA[

&ccode;

]]>
</programlisting>
...

but it of course ignores everything in CDATA. 

Is there some way to place C-code with "dangerous" characters 
like &,$,(,) without modifying external file with C-code?

Sorry for my english,
Thank you.





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