[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Integration By InfoSet Abstractions (WAS RE: Out of topic or o
We went round and round this topic in the X3D project. On one side, the XMLers wanted a DOM-based API. On the VRML side, the implementors wanted a scene-graph API. The DOM API, being generic, offered many opportunities for the naive script developer to attempt illegal operations on the scene graph API. So the counter that the DOM API being well-learned and understood worked against the efficiency of the product given that the implementor had to trap for these operations and confuse the scripter. I suspect the same can be true of other object-oriented applications. Note that the conflicts over this issue lead many serious and funded implementors to walk away from X3D. This is one where the business case and the technical approaches were conflated and are in conflict. Integration by infoset abstraction is asserted to be a technical solution that can by dint of heroic effort be made to work, but might not produce a performant application, thus leveraging the learning curve of XML may not be of value given the market for real time 3D is sensitive to performance. X3D itself is going forward and the results of the decisions will be proven as they traditionally are when conflicting philosophies of system architecture clash violently: in the running code. len -----Original Message----- From: Didier PH Martin [mailto:martind@n...] I think we are witnesses of the clash between these two patterns. In case (b) xml is not well integrated as a language type and (b) seems to be the remedy (using function calls instead of data types) but with the conterpart of not seeing the XML anymore (in addition to other secondary effects already mentionned in this list). In case (a) we have direct contact with an XML format but its underlying data structure is accessed as an external entity not as a direct data type. Moreover, in (a) all semantics is lost in the process since the procedural language is dealing with elements and attributes instead of concrete objects like accounts, clients or whatever expressed as variables. If anybody resolve the impedence mismatch in a language like, for instance, in Java and provide access to the semantics entities instead of the generic abstraction of the DOM maybe the average developer would be more inclined to expreiment with integration through data intead of integration through function calls.
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