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

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