See this overview of GND concept types and number of concepts in GND and mapped concepts in Wikidata. Without concept types a concordance between concept scheme A and concept scheme B could be
number of distinct concepts in A mapped from
number of distinct concepts in B mapped to
This feature can be implemented as offline procedure that is calculated on schedule instead of a live query. Result could be stored in additional fields of Concordance object, e.g. domainSize and rangeSize or statistics (with subfields). Extend of individual concept schemes A and B can be used to calculate mapping coverage.
See this overview of GND concept types and number of concepts in GND and mapped concepts in Wikidata. Without concept types a concordance between concept scheme A and concept scheme B could be
This feature can be implemented as offline procedure that is calculated on schedule instead of a live query. Result could be stored in additional fields of Concordance object, e.g.
domainSizeandrangeSizeorstatistics(with subfields). Extend of individual concept schemes A and B can be used to calculate mapping coverage.