Request: Add values to the FilterOperator value set

Context: create a Profile on ValueSet that aligns with Value Set Definition.

FilterOperator has a required binding to to compose.include.filter.op https://www.hl7.org/fhir/valueset-filter-operator.html

VSD models 2 elements to define what corresponds to compose.include.filter.op. One of which is a boolean (ContentSystemElement.CodeBasedContent.IncludeRelatedCodes.IncludeHeadCode) and the other is a code with required values to define traversal (ContentSystemElement.CodeBasedContent.IncludeRelatedCodes.RelationshipTraversal) (TransitiveClosureLeaves, DirectRelationsOnly, TransitiveClosure)

The combinations available with the two VSD elements are not all covered in the FilterOperator value set. For details - see https://confluence.hl7.org/display/VOC/Resource+element+list row 57

The following VSD allowed combinations are missing from the value set and need to be added (codes TBD)

DirectRelationsOnly with HeadCode = FALSE

DirectRelationsOnly with HeadCode = TRUE

TransitiveClosureLeaves with HeadCode = FALSE

TransitiveClosureLeaves with HeadCode = TRUE

(note: VSD TransitiveClosure with HeadCode = TRUE maps to FilterOperator "is-a"

VSD TransitiveClosure with HeadCode = FALSE maps to FilterOperator "descendant-of"