valueFilter extension for DataRequirement

Define a valueFilter operator to allow specification of additional filtering: valueFilter Extension usable on DataRequirement 0..* valueFilter.path string 0..1 valueFilter.searchParam string 0..1 valueFilter.comparator code 1..1 Required binding to { eq, gt, lt, ge, le, sa, eb } valueFilter.value [x]  ( boolean, string, integer, Quantity, Ratio, Range ) 0..1 Invariant: one of path or searchParam SHALL be present The value set for the comparator code should be created based on the Search Comparator value set http://hl7.org/fhir/codesystem-search-comparator.html Note that the codes ne (Not Equals) and ap (Approximately) from the Search Comparator code system are purposely not included in this value set, because they are not suitable for indexing access.