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astrothesaurus / UAT

The Unified Astronomy Thesaurus is an open, interoperable and community-supported thesaurus of astronomical and astrophysical concepts and their relationships.
http://astrothesaurus.org/
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keywords don't form a hierarchy. #280

Closed davidwhogg closed 4 years ago

davidwhogg commented 4 years ago

Decision-making (#279) fits under Engineering (#278) but also under statistics and under bayesian statistics and other locations. Also, when I go down to classification I get support vector machine (but not target selection!) but svm can also be used for regression. So it isn't a hierarchy and that concept should be dropped. It is a network.

katieefrey commented 4 years ago

The UAT is best described as a polyhierarchy, where a concept can have multiple parents. Mostly this means that there are many different ways to travel the hierarchical paths to find a concept.

The reason it is still a type of hierarchy is that a concept should not be it's own parent or grandparent, etc. I think the polyhierarchy model works for the situation you described, where a concept could be found in multiple locations.

For an example in the current UAT see "Beta Cepheid variable stars" which is found under these five different parent concepts: Cepheid variable stars Early-type variable stars Multi-periodic variable stars Pulsating variable stars Short period variable stars

davidwhogg commented 4 years ago

Okay good. Then I think I can live with this, although there are pathologies I can imagine.