is#IR_system
  supertype:  software__software_system__software_package__package  (computer science) written programs or procedures or rules and associated documentation pertaining to the operation of a computer system and that are stored in read/write memory; "the market for software is expected to expand"
  tool of:  IR_task
  subtype:  distributed_IR_system
     subtype:  distributed_hypertext_IR_system__distributedhypertextirsystem  e.g. the WWW
        subtype:  WWW
     subtype:  Semantic_Web
  subtype:  hypertext_system__hypertextsystem  a database management system that allows chunks of text (objects) to be processed as a complex network of nodes that are linked together in an arbitrary way

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