The models and contexts in GELLO can be bespoke, that is they can be custom designed for a given implementation. In health FHIR could well be one such model, instead of the HL7 V2 VMR Medical Objects uses.
This section describes some simple models built and implemented against in various non health domains, purely by way of example.
Engineering example
This first example will walk through an idea of building a small mechanical engineering ontology that started life with reference to https://fastenerengineering.com/what-are-pins/ . This ontology then will be used in a GELLO query along with information model instance data.