RE: Most XML vocabularies are too large and inevitably have lo
Not sure about the case for schema or instances of it, but with DTDs as the number of cases a single DTD is made to support, the weaker the support becomes. This is a problem for XML where DTDs validate one end of a production and XSL performs post-validation substitutions. The DTD cannot be written tightly enough to ensure the XSL consumes the right tags and outputs the correct XSL-FO, for example. We really do lose a lot of time and money to the inability or unwillingness of providers to create, maintain and provide multiple tight definitions over singular loose ones. len -----Original Message----- From: Michael Kay [mailto:firstname.lastname@example.org] Sent: Sunday, December 18, 2011 2:17 PM To: email@example.com Subject: Re: Most XML vocabularies are too large and inevitably have lots of "holes" Indeed, most standards are too large. XML is too large. Attributes are unnecessary, mixed content is unnecessary, namespaces are unnecessary: without these unnecessary concepts, XSD and many other things would have been much simpler. XSD is certainly too large. Many application-level standards such as FpML and HL7 are too large. But stating that something is too large doesn't help to make it smaller. (There was a W3C workshop on XSD where everyone agreed it was too big but no-one could agree which bits were unnecessary.) There's a basic problem that the more people you involve in a design, the larger and more complex it becomes. At the extreme, this leads to the failure of billion-dollar IT projects. This is a sociological problem in the way systems are created. But recognizing the fact doesn't make it go away. Looking to mathematics for inspiration isn't particularly constructive, because IT systems have to fit into the real world, and the real world itself suffers from excess complexity; a specification can also fail because it oversimplifies, or because it imposes too high a level of abstraction. Michael Kay _______________________________________________________________________ XML-DEV is a publicly archived, unmoderated list hosted by OASIS to support XML implementation and development. To minimize spam in the archives, you must subscribe before posting. [Un]Subscribe/change address: http://www.oasis-open.org/mlmanage/ Or unsubscribe: firstname.lastname@example.org subscribe: email@example.com List archive: http://lists.xml.org/archives/xml-dev/ List Guidelines: http://www.oasis-open.org/maillists/guidelines.php
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