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"Koha utilise le moteur d'indexation open-source Zebra. Le site http://www.indexdata.dk/zebra/ présente Zébra comme : "un outil hautement performant permettant d'indexer et de rechercher du texte structuré. Il est capable de lire les enregistrements dans différents formats d'entrée (par exemple email, XML, MARC) et donne accès aux données grâce à l'utilisation d'équations de recherches booléennes et de requêtes en texte libre. Zebra supporte de grosses bases de données ( dizaines de millions d'enregistrements, dizaines de gigabytes). Il permet la mise à jour incrémentale de la base de données sur des systèmes en production. Du fait que Zebra support le protocole de recherche Z39.50, vous pouvez rechercher dans les bases de données Zebra par l'intermédiaire d'une grande variété de programmes et outils, commerciaux ou libres, qui sont capables de communiquer via ce protocole." (traduit du Zebra - User-s Guide and Reference, p3, http://www.indexdata.dk/zebra/doc/zebra.pdf)."

"Zebra is a high-performance, general-purpose structured text indexing and retrieval engine. It reads structured records in a variety of input formats (eg. email, XML, MARC) and allows access to them through exact boolean search expressions and relevance-ranked free-text queries. Zebra supports large databases (more than ten gigabytes of data, tens of millions of records). It supports incremental, safe database updates on live systems. You can access data stored in Zebra using a variety of Index Data tools (eg. YAZ and PHP/YAZ) as well as commercial and freeware Z39.50 clients and toolkits. Zebra is free software, available under the GPL license."

"MasterKey is a growing and evolving family of tools for building sophisticated information discovery solutions. They can be used individually, or they can be combined together using a shared service-based architecture. Some of the tools have been released by Index Data under OSS (open source software) licenses, whereas others, at this time, are made available exclusively to our customers. To complement the software, Index Data offers a full range of support, consulting, and development services. For businesses, our components are flexible and modular enough to fit into practically any existing software platform. For consortia and larger libraries, we offer an opportunity to create a solution which is uniquely adapted to local needs, while also based on open software components and open standards."