Primary Classification:
  H. Information Systems
  H.3 INFORMATION STORAGE AND RETRIEVAL
      H.3.1 Content Analysis and Indexing
          Subjects: Indexing methods

Additional Classification:
  F. Theory of Computation
  F.3 LOGICS AND MEANINGS OF PROGRAMS

  H. Information Systems
  H.3 INFORMATION STORAGE AND RETRIEVAL
      H.3.3 Information Search and Retrieval
          Subjects: Information filtering
  H.5 INFORMATION INTERFACES AND PRESENTATION (I.7)
      H.5.2 User Interfaces (D.2.2, H.1.2, I.3.6)
          Subjects: Natural language

  I. Computing Methodologies
  I.5 PATTERN RECOGNITION

General Terms:
Design, Documentation, Languages, Management, Measurement, Performance, Theory

Keywords:
clustering, indexing methods, information filtering, linguistic processing