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IMS Open Corpus Workbench Icon

IMS Open Corpus Workbench

Indexing and query tools for very large text corpora

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The IMS Open Corpus Workbench is a collection of tools for managing and querying large text corpora (100 M words and more) with linguistic annotations. Its central component is the flexible and efficient query processor CQP, which can be used interactively in a terminal session, as a backend e.g. from a Perl script, or through the Web-based GUI CQPweb.

IMS Open Corpus Workbench Web Site


Linguistics, Languages


  • Index corpora into a compact and swiftly-searchable format (with Unicode support!)
  • Search corpora efficiently using the super-fast Corpus Query Processor (CQP)
  • Queries can contain regular expressions on individual words or annotations, AND across sequences of words
  • Support for indexing and querying of within-text XML elements and attribute values
  • Plus CQPweb: a user-friendly online interface with lots of additional features, especially suitable for teaching and for non-specialists


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