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Subject: Re: [egov] Tactics on data alignment / standardization
At 09:46 PM 7/23/2003 -0400, David RR Webber wrote: >Carl, > >On quick inspection you deserve an award for the most complex >XML application I have seen, and also for using the most >complex parts of the W3C specifications. To me, it seems the GML approach is to use XML Schema as a tool for representing semantic relationships as well as data type syntax. So, a "polygon" is not merely defined in terms of its syntax as a set of coordinate pairs, but it is derived from a chain of abstract types that mark higher levels of geometric abstraction. That's not wrong in itself, expect that it makes the whole structure fiendishly difficult to handle and very obtuse to understand. IMHO, GML could employ a simple XML Schema type system supplemented by an ISO 11179 semantic register. BTW, for those interested in emergency management, the OASIS EM TC is now testing the Common Alerting Protocol (CAP) and there is a rendition of alerts as a GML "FeatureCollection" (aka "map layer"). Eliot
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