"Hello world!" Example of XSD

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This section describes a simple example of XSD called 'Hello World'.

Before getting into details of XML Schema specifications, let's look at a simple example of XSD (a XML schema written in XML Schema language). Here is the content of the XSD example file, hello.xsd:

<?xml version="1.0"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
 <xsd:element name="p" type="xsd:string"/>
</xsd:schema>

Note that:

• This XSD file is a true XML document with the root element named as "schema".
• This XSD file contains one "Element Declaration" statement <element ...>.
• The "Element Declaration" statement declares that the conforming XML documents must have a root element named as "p".
• The "Element Declaration" statement also declares that the root element "p" should have content of "string" type.

Obviously, hello.xsd is a very simple XML schema. Writing an XML document that conforms to hello.xsd is easy. There is an example, hello.xml

<?xml version="1.0"?>
<p>Hello world!</p>

Let's validat hello.xml against hello.xsd:

• hello.xml has a root element of "p" which matches the name declared in hello.xsd.
• The content of "p" is a string, "Hello world!", which matches the datatype declared in hello.xsd.

Now we can say that hello.xml is a valid document, conforming to hello.xsd.

Sections in This Chapter

What Is XML Schema?

"Hello world!" Example of XSD

XML Schema Processors