32 lines
1.6 KiB
Markdown
32 lines
1.6 KiB
Markdown
# xbib Contextual Query Language Compiler for Java
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CQL, the Contextual Query Language, is a formal language for representing queries to information retrieval systems.
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Its objective is to combine simplicity with expressiveness, to accommodate the range of complexity from
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very simple queries to very complex. CQL queries are intended to be human readable and writable, intuitive,
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and expressive.
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This Java implementation can parse and generate CQL syntax, and translates CQL to Elasticsearch query language.
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It also support extensive query options, filter queries and faceting, with breadcrumb state support
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(checkboxes to add or remove facte values from a query).
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More about CQL can be found under
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link:http://docs.oasis-open.org/search-ws/searchRetrieve/v1.0/os/part5-cql/searchRetrieve-v1.0-os-part5-cql.html[the searchRetrieve 1.0 CQL specification].
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## License
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Copyright (C) 2012-2022 Jörg Prante
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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you may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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