http://hl7.org/fhir/StructureDefinition/cqf-modelInfo-primaryCodePath|5.2.0

Specifies the primary code path for the class constructed in the model info for the profile (i.e. the path to the code-valued element on the resource that should be used as the default terminology filter when no terminology target is specified in a CQL retrieve).
element_idtypes
Extension
Extension.url
Extension.value[x]
Extension
Extension.id
Extension.extension
Extension.url
Extension.value[x]