CPV code 72330000 designates Content or data standardization and classification services in the Common Procurement Vocabulary (CPV 2008), the EU classification used to describe the subject of public contracts.
72330000 is a leaf code — the most specific level of its branch — so it can be used directly as the main CPV code of a contract notice. If it does not quite fit, check the neighbouring codes under 72300000 (Data services).