Does anybody know whether the MARC formats at:

<http://www.loc.gov/marc/authority/>
<http://www.loc.gov/marc/bibliographic/>
<http://www.loc.gov/marc/classification/>
<http://www.loc.gov/marc/community/>
<http://www.loc.gov/marc/holdings/>

are encoded in an XML format that one might use for processing/validation of the leader, field tags, indicator codes, subfield codes, field and subfield repeatability, and field and subfield requiredness.  Something akin to the codepoint table in XML at:

<http://www.loc.gov/marc/specifications/codetables.xml>


Thanks, Andy.