Example code for evaluating FhirPath expressions using Firely. Self hosts endpoints for REST calls to locate external Fhir resources with sample json files. Examples include:

• Basic expression compilation and evaluation
• Use of resolve() FhirPath function to resolve referenced resources
  • Contained resources
    • Requirement of ScopedNode when using resolve() to locate contained resources
  • External resources
    • Use of the ElementResolver property of the FhirEvaluationContext class to resolve external resources
• Standard and extended functions in the SymbolTable
  • Standard functions (default in FhirPathCompiler) - Link
  • ExtensionFunctions - Link
    • hasValue
    • resolve
    • memberOf
    • htmlChecks
• Use of FhirClient to query a REST endpoint for resources
• Custom FhirPath function used in an expression
• Custom EvaluationContext for passing custom instance into a custom function