Definition: Theoretical correspondence
A theoretical correspondence between two classifications (A and B), or two versions of the
same classification, is made of pairs of codes, one from each classification. When a pair is
included, this means that the content (or part of it) of the A code is included in the content of
the B code.
Eurostat, Task Force on the implementation of NACE Rev. 2, "Implementation Glossary", Version 1.0, Luxembourg, March 2006