xml schema mapping language

Hello,

I'm searching for a "XML Schema Mapping Language", a language in which one 
could express mappings between different XML schemas or different versions 
of a schema. I searched for any related term I can imagine, but I found 
nothing. 

What this language should be able to express is roughly the same as what 
can be done with Altova MapForce, but in a XML notation so that one is 
able to generate XSLT Update stylesheets for the instance-documents of the 
schemas. I already tried MapForce, but I found no possiblity to save the 
created mapping in a XML format.

Is such a "schema mapping language" already available? Where?

Thank you in advance for any insight

Greetings Christoph

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<br><font size=2 face="sans-serif">Hello,</font><br><br><font size=2 face="sans-serif">I'm searching for a &quot;XML Schema
Mapping Language&quot;, a language in which one could express mappings
between different XML schemas or different versions of a schema. I searched
for any related term I can imagine, but I found nothing. </font><br><br><font size=2 face="sans-serif">What this language should be able to
express is roughly the same as what can be done with Altova MapForce, but
in a XML notation so that one is able to generate XSLT Update stylesheets
for the instance-documents of the schemas. I already tried MapForce, but
I found no possiblity to save the created mapping in a XML format.</font><br><br><font size=2 face="sans-serif">Is such a &quot;schema mapping language&quot;
already available? Where?</font><br><br><font size=2 face="sans-serif">Thank you in advance for any insight</font><br><br><font size=2 face="sans-serif">Greetings Christoph</font><font face="sans-serif"><font face="sans-serif, Arial, Helvetica" size="-1" color="#808080"><br>If you are not the intended addressee, please inform us immediately that you have received this e-mail in error, and delete it. We thank you for your cooperation.
<br></br> 
                                                                          
</font></font>