Tag_omission
Tag omission is an optional feature to minimize an SGML document. Whenever a tag can be implicitly anticipated by the parser from the structure of the document, the tag can be omitted.[1] The tag omission feature can be generally enabled or disabled in the SGML Declaration. The Document Type Definition is used to enable or disable the tag for a specific tag.
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Tag omission is one of the main features of SGML which was removed from XML to simplify parsing.