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A.2 Lexical Type Definition Requirements (LTDR)

Subclauses:

This clause states the requirements for the formal definition of lexical types. A "lexical type" is a pattern of characters to which a character string can conform. The pattern is called a "lexical model". A lexical type declaration associates a name with a lexical model, defining a named lexical type.

Lexical types defined in accordance with these requirements are used in conjunction with the HyTime lexical model notation (HyLex; see A.2.3 HyTime lexical model notation (HyLex)) to prescribe the lexical characteristics of attribute values and of the data content of elements (see 5 Notation and A.5.4 Lexical types). They are also used when searching a "match domain" for strings or token lists that satisfy a lexical pattern (see A.4.4.2 Data tokenizer (DATATOK) grove construction).

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This electronic document is for use during development and review of International Standards. Official printed copies of International Standards can be purchased from the ISO and the national standards organization of your country.

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