How can I index MARCXML files?

Specifically, I want to index the "title" fields of MARCXML files. They 
exist as bits of an XML that look like this:

   <datafield tag="245" ind1="0" ind2="2">
     <subfield code="a">A general introduction to the
      great books and to a liberal education,</subfield>
     <subfield code="c">by Mortimer J. Adler and Peter Wolff.
      With a pref. by Robert M. Hutchins.</subfield>
   </datafield>

In other words, is there some way to use the MetaNames directive in a 
swish-e configuration file to pull out things like "tag=245" as well as 
"code=a"?

-- 
Eric Lease Morgan
Head, Digital Access and Information Architecture Department
University Libraries of Notre Dame

574/631-8604