I'm currently using the following pattern to catch the target files for the 
SKOS plugin:

<map:match pattern="**skos.xml">
...
</map:match>

As the pattern suggests, files whose name ends with 'skos.xml' will be 
processed as SKOS files. Fine, but how bad is it?

The issue FOR-1005 [1] suggests that the 'sourcetypeaction' mechanism should be 
used 
to determine the type of a file and set actions accordingly. We see in FOR-1018 
[2] 
that we need to extend our existing implementation of the sourcetypeaction 
mechanism 
to be able to support RDF/XML formats.

One might take an approach similar to bootstrapping, that is:

0. Try to determine the file type by parsing the filename; if failed,
1. Fallback to sourcetypeaction mechanism with a minimum number of tests; if 
failed,
2. Type left undetermined, that is no actions.

If we decide to parse the filename to determine the type of a file, then we'll 
need to have conventions set for each format.

What do you think should be done to determine the type of RDF/XML formats?

SinDoc

[1] http://issues.apache.org/jira/browse/FOR-1005
[2] http://issues.apache.org/jira/browse/FOR-1018