Where can I find the expression language specification?

Most of the profiles out there, have some type of non structural rule expressed in terms of:

  • hasValue()
  • exists()
  • contains()
  • all()
  • empty()
  • implies

Where can I find the specification of such expression language?

Thanks.

http://hl7.org/fhirpath

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Is there a parser for FHIR paths in HAPI FHIR?

org.hl7.fhir.r5.utils.FHIRPathEngine

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you rock, thanks! . .