Clinical Quality Framework Common FHIR Assets (US-Based), published by Clinical Quality Framework. This guide is not an authorized publication; it is the continuous build for version 0.1.0 built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/cqframework/cqf-us/ and changes regularly. See the Directory of published versions

Query Management

This topic provides query management guidance for implementers to support the use of CQL within FHIR questionnaires, typically from a DTR application:

• Develop a library of reusable CQL expressions and functions that
  • Manage optional server-side parameters
  • Check for modifier elements and extensions
  • Manage optional _include and _revInclude situations
  • Manage _element filtering
  • Manager version differences among servers
  • Provide simpler functions with typical search parameter filters (e.g. including only final and amended observations)
  • Manage extension retrieval for extensions expected to be present (e.g. USCore and CRD extensions)
• Complex element retrieval
  • Establish a core set of complex element functions such as body surface area
• Authoring
• Patterns
• Libraries
  • USCoreCommon
  • USCoreElements
  • USCoreTests