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Glossary of PM20 terms

Entry within a category system (or: classification), e.g. the PM20 countries category system. Categories are defined by their type and a signature.
category type
Indicates the category system:
geo - PM20 countries category system
subject - PM20 subject category system
ware - PM20 ware category system
(or: notation) Short code for a category within a category system, e.g. “A10” for Germany.