Extend Distribution model

[mdoering]

The DwC taxon distribution extension contains many more context fields for species range distributions:

• lifeStage
• occurrenceStatus aka frequency
• establishmentMeans more like our status
• degreeOfEstablishment
• pathway invasiveness
• threatStatus redlists
• appendixCITES
• eventDate temporal context
• startDayOfYear seasonality
• endDayOfYear

For some users like the GRIS network this is essential. Should we just add them +/- all?
What to do with the existing status vocab?

See also sharing of redlists as another use case.

[mdoering]

endemic is another information that people try to publish. That only makes sense when you know the context of the area that the species is considered to be endemic in, so it work as a flag in the Distribution model.

[mjy]

endemic is one of those attributes that reminds me that we would do well to think of or classify all attributes as asserted (as "fact") or inferred (derived from one or more assertions). If we limited our modelling to assertions and kept inferrences isolated (to other files/models), then we would perhaps be better organized.

[mdoering]

Agree it would be good to manage assertions only and infer when needed. Just very often you don't have the complete picture and all you got is someone else's results to share.