anchor.diff:      :
       libraryDefinition?
       usingDefinition*
  -	includeDefinition*
  -	codesystemDefinition*
  -	valuesetDefinition*
  -	codeDefinition*
  -	conceptDefinition*
  -	parameterDefinition*
  -	statement*
  -	;
  +    includeDefinition*
  +    codesystemDefinition*
  +    valuesetDefinition*
  +    codeDefinition*
  +    conceptDefinition*
  +    parameterDefinition*
  +    statement*
  +    ;
   
   /*
    * Definitions
  
positive.code: 
  /*
   * Clinical Quality Language Grammar Specification
   * Version 1.3 - May 2018 STU3 Ballot
   */
  
  import fhirpath;
  
negative.code:     | 'timezone'
      ;
  
  pluralDateTimePrecision
      : 'years' | 'months' | 'weeks' | 'days' | 'hours' | 'minutes' | 'seconds' | 'milliseconds'
      ;
  
  