XML Guide

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Validating XML Files with a DTD or Schema

A valid XML file conforms to the structure of an associated DTD or schema file.

To reference the location and name of a DTD file, use the DOCTYPE declaration in an XML file. The DOCTYPE declaration also names the root element for the XML file.

For example, the following XML file references the location of the note.dtd file:

<?xml version="1.0"?>
<!DOCTYPE note SYSTEM
"http://www.w3schools.com/dtd/note.dtd">
<note>
    <body>XML Data</body>
</note>

To reference a schema, use the schemaLocation declaration. The schemaLocation contains the location and name of a schema.

The following XML file references the note.xsd schema in an external location:

<?xml version="1.0"?>
<note xsi:SchemaLocation="http://www.w3schools.com note.xsd">
   <body>XML Data</body>
</note>

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XML Guide

XML Guide

Validating XML Files with a DTD or Schema

Validating XML Files with a DTD or Schema