Such occurrences are generally external with the document of matter chart itself (although they can
Such occurrences are generally external with the document of matter chart itself (although they can also be inside it), and they “are directed” to use some mechanisms the system supports, typically with the addressing of URIs (in XTM) or HyTime (in HyTM). Today, the majority of the systems to create hand-wrought indices (in opposition to index with complete text) employ a certain form of profit profit margin included in the document to classify.