PJS001 - Correct name of conversion based units

[aothms]

IfcConversionBasedUnit has a string label for its name, but the docs have a recommended table of units. I would propose the following two rules:

• Case: use lowercase (always? or when part of the table?)
• Value: when using a name from this table make sure the value conforms to the table.

https://ifc43-docs.standards.buildingsmart.org/IFC/RELEASE/IFC4x3/HTML/lexical/IfcConversionBasedUnit.htm

[civilx64]

Case: use lowercase (always? or when part of the table?)

The docs state that the name is case insensitive so IMO no need to have a rule for that. But there should be a rule to ensure that the (case insensitive) name of a conversion-based unit appears in the table. Example:

US SURVEY FOOT is valid, foot_US is not.

Value: when using a name from this table make sure the value conforms to the table.

Agree, with some tolerance to account for both entering the value exactly as shown in the table versus calculating or deriving it from unit libraries. For example someone might use the pint library to derive the conversion factors.