Re: Beginner question - What is a schema?
On Mon, 24 Jan 2000, Doug Forman wrote: > Can anybody give me a good definition of what is a schema, and how it > applies to xml? > > My understanding is that it is a logical template for a heirarchical > database; and any xml document is based on some schema. Insert ', such as' right after 'template' and you'd be correct. A schema is simply an (abstract) specification for how things relate to each other and what can go where. It may be implicit, e.g. defined by how some code processes a particular type of XML document, or it may be explicit, such as a DTD or a document written in the instance syntax proposed in the W3C's XML-Schema draft. An explicit, machine-readable schema is necessary if you want an XML processor to be able to tell you whether a document is valid according to its rules, or to provide default values for certain kinds of omitted data. In many applications, this isn't necessary, but it's almost always useful to have some formalized schema, even if it exists only on paper, as documentation. xml-dev: A list for W3C XML Developers. To post, mailto:xml-dev@i... Archived as: http://www.lists.ic.ac.uk/hypermail/xml-dev/ or CD-ROM/ISBN 981-02-3594-1 Unsubscribe by posting to majordom@i... the message unsubscribe xml-dev (or) unsubscribe xml-dev your-subscribed-email@your-subscribed-address Please note: New list subscriptions now closed in preparation for transfer to OASIS.
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