Information Retrieval: Query types

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Note: the content of this post is mainly notes taken from professor Stefano Mizzaro’s lessons on (Web) Information Retrieval at Uniud.

There are 3 types of queries that an IRS can receive:

  1. Keyword based
  2. Pattern matching
  3. Structural

Keyword based

Can be divided in:

Pattern matching

Can be divided in:

In pattern matching it is good practice to allow errors, both in queries and in documents. Levenshtein distance can be used.


Based on the structure of the text. Since the web was invented they became more important. Can be divided in:

More query types