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Taxonomy | Description | Relevance
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[Product Ontology](http://www.productontology.org/) | This service provides ca. 300,000 precise definitions for types of product or services that extend the schema.org and GoodRelations standards for e-commerce markup. | Definitions of Resource Types for Value Flows
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[Agrovoc](http://aims.fao.org/vest-registry/vocabularies/agrovoc-multilingual-agricultural-thesaurus) | This taxonomy includes agricultural and food information in [SKOS](https://en.wikipedia.org/wiki/Simple_Knowledge_Organization_System) narrower-broader hierarchical relationships. | Example of a Resource Type taxonomy for Value Flows |
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