Models for ISO 19112

[PeterParslow]

The HTML view of the model, at http://iso.sparxcloud.com/index.php contains two packages, for Edition 1 and Edition 2. The Edition 2 package contains a diagram called "ISO 19112 Edition 2 - after EC discussion" (which suggests it isn't the final package for the standard).

Several of the diagrams differ from the diagrams in the published standard (2019, with corrigendum later that year). For example:

• the multiplicity at each end of the self-referential LocationClass relationship differs between the online model & the standard
• the relationship between LocationClass & Location is suppressed (or missing) in Figure 3 of the standard.

[jetgeo]

@jetgeo will look at it and try to clean