Tags and keywords
It's a good idea to identify ValueTypes early on. They can be organised in a top-level 'value' Package (or Model package) or owned by other Packages or even by Blocks:
The ValueType and Unit names in the ISO-80000 ModelLibrary are rather verbose. It's easy to create your own equivalents with concise naming and Unit indications.
TIP: Where possible create custom Units with the name the same as the symbol