Module traits 

Version-Agnostic FHIR Abstraction Traits

This module provides trait abstractions that enable the SOF crate to work with ViewDefinitions and Bundles across multiple FHIR versions without duplicating transformation logic. Each FHIR version implements these traits to provide uniform access to their specific data structures.

Architecture

The trait system follows a hierarchical pattern:

• Top-level container traits (ViewDefinitionTrait, BundleTrait)
• Component traits (ViewDefinitionSelectTrait, ViewDefinitionColumnTrait, etc.)
• Version-specific implementations for R4, R4B, R5, and R6

Design Benefits

• Version Independence: Core processing logic works with any FHIR version
• Type Safety: Compile-time verification of trait implementations
• Extensibility: Easy addition of new FHIR versions or features
• Code Reuse: Single implementation handles all supported versions

Traits

BundleTrait

Trait for abstracting Bundle across FHIR versions.

ResourceTrait

Trait for abstracting Resource across FHIR versions.

ViewDefinitionColumnTrait

Trait for abstracting ViewDefinitionColumn across FHIR versions.

ViewDefinitionConstantTrait

Trait for abstracting ViewDefinitionConstant across FHIR versions.

ViewDefinitionSelectTrait

Trait for abstracting ViewDefinitionSelect across FHIR versions.

ViewDefinitionTrait

Trait for abstracting ViewDefinition across FHIR versions.

ViewDefinitionWhereTrait

Trait for abstracting ViewDefinitionWhere across FHIR versions.