[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: Various presentations, schema concepts, etc.
KenNorth wrote: > That development paradigm was procedural and process-oriented. The industry > has since moved to object-orientation, and I think we're about to make the > next great leap -- declarative programming. We'll express rules and > constraints instead of designing processes or objects. But underneath that may still be a certain tension between XML as espoused by vendors with different schema-compilation strategies: 1) static, public -- e.g. closed schemas in public repositories, or purely local to the document 2) static, extensible -- e.g. open schema with clear positions in which extensions can be declared; public base types customized (extended or restricted or overlapped) as required; but all type info declared in the schema itself. 3) dynamic, extensible -- e.g. where the instance itself may contain constraints and declarations (such as <table cols='4'>... where the number of columns will be 4). I think XML Schemas represents the shift from 1) to 2) but its (correct) emphasis on providing an acceptable fit with RDBMS and Object systems means that supporting stage 3) schemas will be the subsequent great leap forward, not the one impending from XML Schemas. As a side-issue, I predict that XML Schemas will help us understand what people do with DTDs much better too: that will in turn feed into future Schema extensions or overlays or enhancements. Rick Jelliffe *************************************************************************** This is xml-dev, the mailing list for XML developers. To unsubscribe, mailto:majordomo@x...&BODY=unsubscribe%20xml-dev List archives are available at http://xml.org/archives/xml-dev/ ***************************************************************************
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