Compositional Grammar

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  • The specification of the grammar was defined in Augmented Backus-Naur Form (ABNF)

    Footnote Macro

    ABNF as defined by Internet Standard 68, RFC 5234

    . This provided a formal standards-based reference for the grammar's structure.

  • Unnecessary whitespace designators (i.e. <ws>) were removed from several places in the grammar.

  • A maximum length constraint for SNOMED CT identifiers  () was added. consist of a sequence of digits, which must be between 6 and 18 digits in length.

  • The hex code for carriage return (CR) was incorrectly given as '0C' in the previous version. It was corrected to '0D' in the new version.
  • Detailed character encoding information for UTF-8 was added.
  • The definition of term was amended to allow correct parsing by the APG parser generator.

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