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I want to make a couple of use notes:
1) there is a hard-coded per IP query limit of forty requests per minute. Exceed that at the lx2.loc.gov:210/LCDB SRU server, and it will lock you out and not respond to any requests at all for fifteen minutes or so. The response time is so quick that you can exceed that rate. When I modified SRU, I put in a five second pause so that the rate limit would not be exceeded.
2) The record matching is brittle against identifier. The value-add of the OCLC Classify backend was the wideness of applicable responses, and the Library of Congress look up will fail against Most e-book isbns. My suggestion, until I modify library codes further to accept title author ISBN 3-tuple searching, Is to use SRU to get an applicable ISBN, which can be served with fully adequate Dewey and LC call number.
When I figure out how to get title author going o I will update.
Future efforts will also include getting the field 650 and field 655 subject headings, implementing an authority look up for author names against the name and subject authority servers at the Library of Congress, getting VIAF Authority records returned, and figuring out someway to Horse, the free OCLC worldcat web lookup to get OCLC worldcat numbers. However, without any subscription to OCLC Metadata, Which is not possible for non-library entity, it is very hard to do anything with that world, cat number, except for a slightly faster search on the free OCLC world cat page.
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