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XML Schema is an XML based alternative to DTD.
An XML schema describes the structure of an XML document.
The XML Schema language is also referred to as XML Schema Definition (XSD).
What is an XML Schema? The purpose of an XML Schema is to define the legal building blocks of an XML document, just like a DTD.
An XML Schema:
defines elements that can appear in a document defines attributes that can appear in a document defines which elements are child elements defines the order of child elements defines the number of child elements defines whether an element is empty or can include text defines data types for elements and attributes defines default and fixed values for elements and attributes
In the links page you can find some references for XML-schema definition and tutorial.
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