Evaluating Content MathML

Hello List

For my Bachelors Thesis I am trying to store mathematical expressions in
an ontology via content MathML.

To be able to work with these expressions I need a parser (preferably
Java) which is able to generate content MathML and more important is
able to read MathML expressions, instantiates the variables and returns
the result.

Maybe I am completely blind but I was not able to find anything that
satisfies my requirements.

Actually these were my only findings:
http://www.eteks.com/jeks/en/doc/com/eteks/parser/MathMLInterpreter.html
(which does one part of the job, namely creating MathML output)
and this question: 
http://lists.w3.org/Archives/Public/www-math/2006Apr/0060.html
posted about a year ago.

Is there no parser that can work with content MathML input or am I
completely on the wrong track?

Thanks for your help.

Cheers,

Roman