Is there a standard way to track where IGs use profiles defined in other FHIR IGs (or more likely FHIR Library IGs)? If not, how impractical would it be to maintain a score of which IGs are using USPHPL profiles (either as is or further constrained)? I suspect the USPHPL IG is not the place to do this, but could it be done on an HL7 Confluence page? I think having examples of how these profiles are used would help implementers consistently use them and probably help the PH Work Group track where there is a common need for new profiles.