DDC-Concordance

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DDC-Concordance is an open source (LGPL) search engine developed specially to meet the needs of linguistic researchers. The following properties in particular are relevant:

• Sentence-based or document-based searches
• Statistical queries, not approximations
• additionally to classical search engine properties like boolean operators (AND, OR, NOT), left and right truncation and distance search operators, ddc-concordance also can search for word forms. E.g. a search for "child" will find all documents containing wordforms like child, children etc. This functionality is currently available for english, german and russian.
• ddc-concordance can index metadata from xml documents
• words can be indexed with searchable annotations, especially word forms, lemmas, part of speech-tags and semantic categories
• Interval searches (targeted and symmetrical e.g. NEAR and FOLLOWED_BY)
• searching for phrases
• relevance ranking operator for documents
• ddc-concordance is fast. Indexing of a 100 million words corpus takes approximately 1.5 hours. The first ten hits for simple queries are shown in about 0.2 seconds.
• ddc-concordance can handle huge corpora because of its distributed clustering architecture. The largest known corpus is about 1 billion tokens, but we haven't reached a limit yet.
• currently there is a command line client for linux, a perl interface and a simple cgi script available. We're working on a python interface, too.