is#document_indexation_or_search__document_search__document_structuration  "indexation" also refers to structuring with via markup tags
  supertype:  IR_task  document_management_task
  subtype:  document_indexation
  subtype:  document_search
  subtype:  keyword_based_document_indexation_or_search
  subtype:  metadata_based_structuration_or_search
  subtype:  knowledge_based_document_indexation_or_search
     subtype:  knowledge_based_document_search
        subtype:  conceptual_clustering_from_documents
           subtype:  conceptual_clustering_from_emails

1 statement is about an indirect instance of document_indexation_or_search (conceptual_clustering_from_emails): graph18_on_article
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