This class provides an empty implementation of FHIRPathVisitor,
which can be extended to create a visitor which only needs to handle a subset
of the available methods.
An enumeration that contains all of the FHIR base types, FHIR complex data types, FHIRPath primitive data types, FHIR resource types,
FHIRPath system types and FHIRPath metamodel types needed for evaluating FHIRPath expressions
Processes the resource from one of the entry points, into an in memory resource
a FHIR Path is executed over it, and the output is put out to the screen.