[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: FW: [ANN]: XQuery: A Guided Tour
Howard Katz wrote: This is very interesting chapter. Quotes I found interesting:Jonathan's chapter provides a great introductory overview of XQuery features. Don Chamberlin's excellent chapter on "Influences on the Design of XQuery" can also be found online at http://www.informit.com/content/downloads/chap2_0321180607.pdf "XML Schema was designed to support the validation of documents rather than to serve as the type system for a query language." Oh dear. What about Usage Scenario 5 of the XML Schemas Requirements[1]? "Use schema to help query formulation and optimization. A query interface inspect XML schemas to guide a user in the
formulation of queries. And the design requirement that the datatypes must "define a type
system that is adequate Other good quote, showing the false economy of non-modularity in big specs: * XQuery's design influenced by XML Schema's provision of "a set of primitive types, a type-definition facility, and an inheritance mechanism... (and) the validation process... Nevertheless, members of the working group attempted to modularize the parts of the language that are related to type definition and validation, so that XQuery could potentially be used with an alternative schema language at some future time." Cheers Rick Jelliffe [1] http://www.w3.org/TR/NOTE-xml-schema-req
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