QUDT Release 2.1.24

HEADS UP on some important changes

As announced in the December release, the January release contains two significant changes that will likely require you to change some configurations in your use of QUDT.

1. As SHACL becomes more popular, and because of its validation capabilities over OWL, we have made the SHACL schema the default instead of the OWL schema. What this really means is that in the facade file, the import statement now points to the SHACL graph instead of the OWL graph. The role of the facade file is documented here. If you want to stay with the OWL schema, you can simply edit your local copy of the facade file to import http://qudt.org/2.1/schema/qudt.
2. As directed by GitHub, we have renamed the QUDT master branch to "main". You will see the notice the next time you use the GitHub QUDT repo webpage interface.

Meanwhile, Release 2.1.24 includes some housekeeping:

• (Almost) all quantity kinds now refer to a dimension vector. Note that some quantity kinds are "abstract", such as Viscosity, where the narrower concepts have distinct dimension vectors, so the abstract one has no dimension vector intentionally. (Thanks @jhodgesatmb)
• The UniversalGasConstant is now a Constant, not a QuantityKind, as is appropriate!
• Equated some identical quantity kinds such as Absorptance = Absorbance, and constants ElementaryCharge = AtomicUnitOfCharge. We are now consistently using qudt:exactMatch for this. Also, cleaned up the ElementaryCharge situation to be just a constant and a unit, but not a quantity kind.
• Changed some exactMatch predicates to informativeReference since the object is a web page, not a resource.
• Removed all triples using qudt:baseUnitDimensions. This was left over from long ago, when we were constructing dimension vectors, and is now redundant. (Thanks to @stuchalk for pointing this out)

Thank you as always for providing submissions to extend the size, quality and capabilities of QUDT!