is#document_management_task__document_management
  supertype:  information_sciences_task__information_management_task__information_management__informationmanagement  may be "_subtask" would be more appropriate than "_task" here and in the subtypes
  subtype:  document_indexation_or_search__document_search__document_structuration  "indexation" also refers to structuring with via markup tags
     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_management_task (conceptual_clustering_from_emails): graph18_on_article
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