[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] RE: Creating a single XML vocabulary that is appropriately cus
Hi Andrew, > Couldn't you just have three schema's each containing their own > definition of <book>, which import a common schema where everything > else is defined? > The book sellers will use book-seller.xsd, the distributor will use > book-distributor.xsd etc... seems simple enough? Yes, that will work for my specific example. I think, however, that approach does not scale. For example, suppose that the <Author> element has child elements: <Author> <GivenName>James</GivenName> <Surname>Suroweicki</Surname> </Author> Suppose the book seller needs both child elements, but the book distributor only needs the surname. Thus, the book seller needs this: --------------------------------------------------------- book-seller.xml --------------------------------------------------------- <?xml version="1.0" encoding="UTF-8"?> <Book xmlns="http://www.books.org"> <Title>The Wisdom of Crowds</Title> <Author> <GivenName>James</GivenName> <Surname>Suroweicki</Surname> </Author> <Date>2005</Date> <ISBN>0-385-72170-6</ISBN> <Publisher>Anchor Books</Publisher> </Book> The book distributor needs this: --------------------------------------------------------- book-distributor.xml --------------------------------------------------------- <?xml version="1.0" encoding="UTF-8"?> <Book xmlns="http://www.books.org"> <Title>The Wisdom of Crowds</Title> <Author> <Surname>Suroweicki</Surname> </Author> <Size>5" x 8"</Size> <Weight>15oz</Weight> <MailingCost>$3.90</MailingCost> </Book> It is not possible for book-distributor.xsd to import from a common book schema and say, "I want the <Author> element, but omit the <GivenName> child element." I like the layered approach because it scales well, and maintains a nice separation of concerns - it keeps the task of defining the XML vocabulary separate from the task of constraining the XML vocabulary based on a sub-group's particular business data needs. What do you think? /Roger
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