This defines a "Uniform Resource Number" in a manner identical to that of a uri http://bibframe.org/vocab/uri.html If this isn't a typo for "Uniform Resource Name" as specified by RFC 2141 http://www.ietf.org/rfc/rfc2141.txt could we please have a reference to a definition for this identifier? Or since RFC 2396 http://www.ietf.org/rfc/rfc2396.txt clearly states that URNs are a subset of URIs, maybe we could retire this property entirely in favour of http://bibframe.org/vocab/uri.html ? cheers stuart -- Stuart Yeates Library Technology Services http://www.victoria.ac.nz/library/