This is root element of this document which contains name space definitions for the document elements. It's a referenced element. For detailed description, please refer referenced element doc. It's a referenced element. For detailed description, please refer referenced element doc. Description is not available. Description is not available. Provide an extension hook to customize VendorOURef. Provide an extension hook to localize VendorOURef. This type can hold a number of digits count 15.