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taxonRank

A Schema.org Property

This term is proposed for full integration into Schema.org, pending implementation feedback and adoption from applications and websites.
The taxonomic rank of this taxon given preferably as a URI from a controlled vocabulary – (typically the ranks from TDWG TaxonRank ontology or equivalent Wikidata URIs).
Values expected to be one of these types
PropertyValue
Text
URL
Used on these types
Taxon

Source

http://www.bioschemas.org/Taxon