Which option represents a NOT-a-layer in the FHIR Composition Framework?

• A. Foundation
• B. Base
• C. Data
• D. Clinical

Answer: (C)

In the FHIR Composition Framework, content is organized into named layers that describe how a document is built and governed. The Foundation layer covers the underlying building blocks and governance that support the framework. The Base layer defines the essential FHIR resources and data types that form the core structure used across documents. The Clinical layer contains the actual clinical material and the resources used to record patient-care information. Data, however, is not defined as its own layer within this framework, so it’s the option that does not represent a layer. The other three terms are the recognized layers, while Data pertains to data concerns rather than a framework layer.