Appling CSS class to the source tag in apache doc

[Stefan Baramov]

May be I am mistaken but the class attribute of "source" tag does not
work in Forrest 0.6 for the "pelt" skin. 

I have an xml file defined like this

<source class="my_class">
        My pre
                formatted 
                        text
</source>

This always will result in 

<pre class="code">
        My pre
                formatted 
                        text
</pre>

Notice, that instead of "my_class" the "code" class is used. My question
is why? Is this skin specific? Or a bug? 

The "my_class" is defined in the skinconf.xml of the project in the
<extra-css> section. 

Thanks,
Stefan Baramov