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An Introduction to XML Schemas


XML Schemas help you control what elements appear in your XML documents. Similar to Document Type Definitions, they offer distinct advantages over the older syntax. Dan Wellman provides a basic overview, with examples to get you started working on your own.

Author Info:
By: Dan Wellman
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November 03, 2004
TABLE OF CONTENTS:
  1. · An Introduction to XML Schemas
  2. · Choose Your Schema
  3. · Element Declarations
  4. · Definitions and Elements
  5. · The Complete File
  6. · Validating a Document
  7. · A Few Final Tips

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An Introduction to XML Schemas - The Complete File
(Page 5 of 7 )

Anyway, as this is all that our extremely simple schema document needs in order to validate our extremely simple XML document, we can end the schema with the closing schema element:

</xsd:schema>

The whole file should now look like this:

<?xml version="1.0"?>
<xsd:schema xmlns:xsd="
http://www.w3.org/2001/XMLSchema">
<xsd:element name="news">
  <xsd:complexType>
  <xsd:sequence maxOccurs="unbounded">
    <xsd:element ref="article"/>
  </xsd:sequence>
  </xsd:complexType>
</xsd:element>
<xsd:element name="article">
  <xsd:complexType>
  <xsd:sequence maxOccurs="1" minOccurs="1">
    <xsd:element ref="headline" />
    <xsd:element ref="story" />
  </xsd:sequence>
  </xsd:complexType>
</xsd:element>
<xsd:element name="headline" type="xsd:string" />
<xsd:element name="story" type="xsd:string" />
</xsd:schema>

Save the document with an .xsd prefix. As schema documents are just well-formed XML documents, you can also save it with an .xml prefix and load it up in a browser. If there are any typos or syntax errors in the schema, it wonít load. You need to use an XML compliant browser of course; for the purpose of this article, Iíve used MS IE6.


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