Re-visit taxonomic name and rank MeasurementType classes

[amoeba]

@mbjones and I had a chat about how this EML dataset description was annotated: https://search.dataone.org/view/https%3A%2F%2Fpasta.lternet.edu%2Fpackage%2Fmetadata%2Feml%2Fedi%2F252%2F3.

Specifically, EML Attributes like taxon_rank with a definition of "Taxonomic rank of the organism." were annotated with OBOE:contains measurements of type ECSO:taxonomic classification.

For starters, ECSO:taxonomic classification hasn't been given a definition in ECSO and the term is vague enough to be confusing. In the class hierarchy, its purpose is a little more clear:

Starting from the bottom and working up, @mbjones said:

it would be nice, however, if we had clear guidinace on how to say “the literal string in this column represents a scientific name” or “the literal string in this column represents a scientific rank” and not conflate those two

Can we do this with the above class hierarchy? I don't think we have a Measurement Type for the latter and whether or not we have a Measurement Type for the former is vague at this point. Proper definitions and maybe tweaks to labels might dramatically improve things.

[mbjones]

Note this issue discussion regarding Darwin Core and TCS, which has new activity through a new Taxonomic Names and Concepts interest group at TDWG. Sounds like they will be charged with a formal model of Taxon with associated object properties for TDWG.