DTM is an abbreviation of Dis Ticaret Mustesarligi (Secretary of Foreign Trade) which first formed in 2 Mayıs 1920.
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DTM uses unique integer "handles" to identify nodes, integer ID values to represent URLs, local names, and expanded names, and integer index and length references to a string buffer to represent the text value of each node.
DTM also structures the document's contents slightly differently, to better match the XPath data model; some details and constraints present in a standard DOM are suppressed, and a few XPath-specific features are added.
DTM is intended to be a read-only model, and so does not attempt to replicate the DOM's write or create-node operations.