Which resource describes a set of rules for solving an interoperability problem using FHIR resources?

• A. StructureDefinition
• B. ImplementationGuide
• C. SearchParameter
• D. GraphDefinition

Answer: (B)

ImplementationGuide is designed to capture the agreed-upon rules for using FHIR in a specific interoperability scenario. It brings together profiles (via StructureDefinition), value sets, required extensions, search parameters, and even guidance on workflows and how bundles should be exchanged. In short, it defines how different systems should implement and interoperate for a given use case, providing a single reference for implementers.

StructureDefinition defines the exact shape and constraints of a resource or a profile, which is part of the rule set but not the full package of guidance. SearchParameter describes how resources can be queried, focusing on search behavior rather than overall interoperability rules. GraphDefinition outlines how related resources are connected and navigated, which aids data retrieval and analysis but doesn’t codify the complete interoperability guidance.