Introduction to XML Schema |
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XML Schema is XML-based alternative to DTD.
An XML schema describes the structure of XML documents.
The XML Schema language is referred to as XML Schema Definition (XSD).
A D V E R T I S E M E N T
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What is an XML Schema?
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The purpose of XML Schema is to define the legal building
blocks of an XML document, just like a DTD.
An XML Schema:
- defines element that can appear in a document
- defines attribute that can appear in a document
- defines which element is child element
- defines the order of the child elements
- defines the number of child element
- defines whether an element is empty or include text
- defines data types for an element and attribute
- defines the default and fixed values for elements and
attributes
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XML Schemas are the Successors of DTDs
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We think that very soon XML Schema will be used in most Web
applications as a replacement for DTDs. Here are some reasons:
- XML Schemas are extensible to future addition
- XML Schemas are richer and more powerful than DTD
- XML Schemas are written in XML format
- XML Schemas support data types also
- XML Schemas also support namespaces
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XML Schema is a W3C Standard
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XML Schema became W3C Recommendation 02. May 2001. You
can read more about XML Schema standard in our
W3C tutorial.
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What You Should Already Know
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Before you goes to this tutorial you should have a basic understanding of
the following:
- HTML / XHTML
- A basic understanding of DTD
- XML / XML Namespaces
If you are going to study these subjects first, find the tutorial
on our Home page
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