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.
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Astronomers use a type of star called a Cepheid variable to calculate distances to astronomical objects at galactic and extragalactic distances. This is because it was discovered that the period of the pulsations corresponds to their absolute brightness. There is a formula that then can also take the observed brightness of the object to calculate the distance of the star from Earth in parsecs. Type II Cepheids are usually used. These are population II stars with the characteristics of being metal poor, old, masses < 0.5 MSun and their periods determine subclasses. These subclasses are RV Tauri, W Vir and BL Her. RV Tauri stars including the star RV Tauri itself are massive supergiants. This example takes observations from a catalogue called SIMBAD for the RV Tauri object. The GELLO model is again bespoke but again uses ISO:21090 datatypes. There is an ontological appeal to a parent-child table based on the IVOA Ontology v. 1.3 for checking the supergiant relationship. We will assess a given star's suitability to be identified as a RV Tauri type Type II Cepheid variable star and then check the subtype. (It should be RV Tauri as this is the type exemplar)
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