keyword

The complete set of CQL keywords — every word that has syntactic meaning in the language. This is the union of reserved words and keyword identifiers. Keywords appear as terminal tokens throughout the grammar.

Examples

not exists [Condition: "Diabetes Mellitus"]

define "Has Diabetes":
  exists [Condition: "Diabetes Mellitus"]

define fluent function "ToInterval"(p FHIR.Period) returns Interval<DateTime>:
  Interval[p."start".value, p."end".value]

EBNF

keyword
  : 'after' | 'aggregate' | 'all' | 'and' | 'as' | 'asc' | 'ascending'
  | 'before' | 'between' | 'by' | 'called' | 'case' | 'cast' | 'code'
  | 'Code' | 'codesystem' | 'codesystems' | 'collapse' | 'concept'
  | 'Concept' | 'contains' | 'context' | 'convert' | 'date' | 'day'
  | 'days' | 'default' | 'define' | 'desc' | 'descending' | 'difference'
  | 'display' | 'distinct' | 'div' | 'duration' | 'during' | 'else'
  | 'end' | 'ends' | 'except' | 'exists' | 'expand' | 'false' | 'flatten'
  | 'fluent' | 'from' | 'function' | 'hour' | 'hours' | 'if' | 'implies'
  | 'in' | 'include' | 'includes' | 'included in' | 'intersect' | 'Interval'
  | 'is' | 'let' | 'library' | 'List' | 'maximum' | 'meets' | 'millisecond'
  | 'milliseconds' | 'minimum' | 'minute' | 'minutes' | 'mod' | 'month'
  | 'months' | 'not' | 'null' | 'occurs' | 'of' | 'on or' | 'or'
  | 'or after' | 'or before' | 'or less' | 'or more' | 'or on' | 'overlaps'
  | 'parameter' | 'per' | 'point' | 'predecessor' | 'private' | 'properly'
  | 'public' | 'return' | 'same' | 'second' | 'seconds' | 'singleton'
  | 'start' | 'starting' | 'starts' | 'sort' | 'successor' | 'such that'
  | 'then' | 'time' | 'timezone' | 'timezoneoffset' | 'to' | 'true'
  | 'Tuple' | 'union' | 'using' | 'valueset' | 'version' | 'week' | 'weeks'
  | 'where' | 'when' | 'width' | 'with' | 'within' | 'without' | 'xor'
  | 'year' | 'years'
  ;