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The Document Availability Information Ontology (DAIA) describes the current availability of documents in libraries and similar institutions. Availability can be expressed in terms of specific services. See http://purl.org/NET/DAIA for a specification
A library for XML-based OPAC/ILS access. libxess is a collection of server-side proxies that provide a Marc-XML/REST based interface to the records and holdings of catalogs such as III Millennium. libxess is implemented in PHP, making it easy to deploy.