See here for an article on the DerivSource web site  by Lynn Strongin Dodds which looks at some of the issues that are arising in the space of ISIN codes, International Securities Identification Numbers. The use of ISINs for identifying OTC derivatives under MiFID II, and EMIR from 1st November, is set to greatly increase. This brings many challenges due to the very varied nature of OTC derivatives and will be particularly challenging in energy and commodity derivatives.