http://drupal.org/project/field_indexer sounds like it can do what you want, but it's for Drupal 5 only at this point. AFAIK, that's the closest there is to a "search form construction kit" to allow fielded searching of CCK fields. There's been discussion of this on the Drupal forums.
If you set up a form on your drupal site to search your library catalogue, you could base it on something like the outdated Simple Remote Search module (update to 5.x and call for more input at http://drupal.org/node/269571). Basically all it does is construct a GET URL to your catalogue and hand over searching and display to it, so it would not search your custom content type nodes back on your drupal site.
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Drupal4libcamp
February 27, 2009, Darien Public Library, Darien, CT
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Field indexer module sounds like what you want
http://drupal.org/project/field_indexer sounds like it can do what you want, but it's for Drupal 5 only at this point. AFAIK, that's the closest there is to a "search form construction kit" to allow fielded searching of CCK fields. There's been discussion of this on the Drupal forums.
If you set up a form on your drupal site to search your library catalogue, you could base it on something like the outdated Simple Remote Search module (update to 5.x and call for more input at http://drupal.org/node/269571). Basically all it does is construct a GET URL to your catalogue and hand over searching and display to it, so it would not search your custom content type nodes back on your drupal site.