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Subject: RE: [emergency] Re: Circle and Polygon
Strictly speaking, you don't have to make it a base type because some systems don't process XSD, so an attribute's constraints in XML, per se, are the constraints of the application in the case of a well-formed instance or of a DTD given a valid instance under strict XML interpretation. However, given XSD, that is a good way to do it and possibly useful. XSD is somewhat controversial but I've no objection to its use here. len From: Winfield Wagner [mailto:wwagner@crossflo.com] If the reference system is considered a identified form of measurement or a distinct qualifier it should be an attribute. It is metadata describing a specific quality or context of the element. In order to do this you must make a reference system element its own separate base type. It can not belong in the realm of type text or type code. The reason is metadata attributes should be connected to the type and not just to an element name (reuse). It is not good practice to have single elements with their on special metadata attributes.
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