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An XML Schema describes the structure of an XML document, just like a DTD.An XML document with correct syntax is called Well Formed".An XML document validated against an XML Schema is both "Well Formed" and "Valid"
XML Schema is an XML-based alternative to DTD:
<xs:element name="note">
<xs:complexType>
<xs:sequence>
<xs:element name="to" type="xs:string"/>
<xs:element name="from" type="xs:string"/>
<xs:element name="heading" type="xs:string"/>
<xs:element name="body" type="xs:string"/>
</xs:sequence>
</xs:complexType>
</xs:element>
The Schema above is interpreted like this:
With XML Schema, your XML files can carry a description of its own format.
With XML Schema, independent groups of people can agree on a standard for interchanging data.
With XML Schema, you can verify data.
One of the greatest strengths of XML Schemas is the support for data types:
Another great strength about XML Schemas is that they are written in XML:
If you want to study XML Schema, please read our XML Schema Tutorial.