Agreed, add the following changes to the measure terminology service: Server Operations 1. SHALL support the `metadata?mode=terminology`, returning a list of all supported code systems, whether they are explicitly made available as CodeSystem resources or not 2. To ensure performant operations with large code systems and value sets, a measure terminology service SHALL support [batch] ( https://hl7.org/fhir/http.html#transaction ) operations for at least the following: 1. CodeSystem/$validate-code 2. ValueSet/$validate-code 3. Services MAY require authentication. If authentication is required, it SHALL be in the form of an authentication header (usually a bearer token) that the user can determine in advance and provide to their FHIR tooling in some configuration.   Add support for the following parameters in $validate-code: 3. SHALL support the activeOnly parameter 5. SHALL support the displayLanguage parameter Add support for the following parameters in $expand: 3. SHALL support the activeOnly parameter 5. SHALL support the displayLanguage parameter 6. SHALL support the limitedExpansion parameter 7. SHALL support the default-to-latest-version parameter 11. SHOULD support includeDesignation parameter 12. SHOULD support designation parameter 7. SHOULD support paging parameters