Examples of resource types
http://www.productontology.org/ http://aims.fao.org/vest-registry/vocabularies/agrovoc-multilingual-agricultural-thesaurus http://www.gtin.info/ https://en.wikipedia.org/wiki/International_Standard_Book_Number https://en.wikipedia.org/wiki/Amazon_Standard_Identification_Number http://lifeisfeudal.com/forum/list-jobs-id-s-t3088/ Does not exactly fit, but @elf-pavlik cites it often: http://smiy.sourceforge.net/cco/spec/cognitivecharacteristics.html
More? I know more of them exist...