Andy said: > A "DCMI namespace" is an "XML namesapce" as defined by the > first definition in > http://www.w3.org/TR/REC-xml-names/ An XML namespace is a collection of names, identified by a URI reference [RFC2396], which are used in XML documents as element types and attribute names. > I suppose one might try to make the argument that because DCMI terms are used outside of XML documents, > a DCMI namespace is somehow more than an XML namespace? (But I wouldn't!). I think this is the point I'm struggling towards.... I admit my question might seem a stupid one, or pedantry just for the sake of it, but it seems to me that an XML Namespace can only be a collection of "names... that are used in XML documents as element types and attribute names". It seems to me that on this basis an XML Namespace can _not_ be a collection of DCMI terms, because a DCMI term is _not_ an XML element type name or XML attribute name. A DCMI term might (sometimes) be _represented_ by an XML element type name or an XML attribute name but that's not the same thing. So a "DCMI namespace" is not an XML namespace, it's a "term set" or something like that..... That still fits with Patrick's comment earlier on today that the "defining resource" can be anything in the universe, but I think it's something slightly different from an XML Namespace. Pete