Clinical Quality Language Publication Directory
This page is part of the Clinical Quality Language Specification (v1.5.2: Normative - Normative) based on FHIR R4. This is the current published version. For a full list of available versions, see the Directory of published versions 
Update 1 Changes:
#954: Changed define clause within the query to let clause to avoid ambiguity in the grammar, as well as potential confusion regarding local vs global defines
#951: Comments moved to the HIDDEN channel
#950: Changed “matches” to “~”
#949: Changed list indexes to be 0-based instead of 1-based
#948: Changed string literals and identifiers to use industry-standard escape sequences
#944: Clarified example in 2.5.8.2
#911: Fixed incorrect reference to MinValue in 9.6.9
#827: Added List<Code> to Code conversion as implicit
#823: Fixed incorrect definition of the Concept type in 9.1.4
#804: Added Exp operator, inverse of Ln
#803: Renamed Expand to Flatten to better reflect operator semantics
#802: Added examples for properly includes and properly included in
#801: Fixed typographical error
#765: Clarified behavior of value set expansion when code system version is not specified
#763: Added weeks as a supported duration
#762: Fixed an invalid cross reference
#741: Corrected out-of-date diagram of interval operations
#735: Fixed mapping of between operator to ELM
#721: Clarified behavior for forward/circular expressions and function definitions
#719: Clarified behavior of a library when no library header is specified
#718: Clarified documentation of the path attribute for the Property type in ELM
#716: Added ability to use between as an interval constructor for comparison
#713: Corrected description of implicit conversion between structured and class types
#714: Corrected signatures for the Multiply operator in 9.6.11
#715: Clarified that during is a synonym of included in
1.1 Review #1: Changed <> operator to !=
1.1 Review #2: Added support for forward function declarations
1.1 Review #3: Fixed table headers for implicit conversion table
1.1 Review #4: Clarified wording for tuple conversion description
1.1 Review #5: Clarified requirements for indexers in property paths
1.1 Review #6: Clarified semantics for multiplication and division involving quantities
#966: Improved semantics of usingDefinition production rule in grammar
#991: Clarified semantics of the conditional expression
#720: Added top-level constructs for code and concept