Classification Class(es) divide products into certain categories of similar product(s), the product-groups.
Every Classification Class has the following main attributes
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a unique identifier (IRDI),
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preferred name
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a coded name that represents the classification structure, e.g. 27-01-01-01
Example: ECLASS contains a monohierarchical classification system formed by Classification Classes, i.e. every product group is to be found only once in the hierarchical tree structure.