opacclient
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Support SRU, DAIA and maybe PAIA
https://verbundwiki.gbv.de/display/VZG/SRU https://verbundwiki.gbv.de/display/VZG/PAIA https://verbundwiki.gbv.de/display/VZG/DAIA
A lot of libraries using SRU can be found using http://uri.gbv.de/database/