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XML Schema |
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Schemas, the sender can describe the data in
a way that the receiver will understand. A date
like: “03-11-2004” will, in some countries, be
interpreted as 3.November and in other
countries as 11.March.However, an XML element
with a data type like this: <datetype=”date”>2004-03-11</date> ensures a mutual understanding of the content,
because the XML data type “date” requires the
format “YYYY-MM-DD”.
Designing XML Schema
XML documents can have a reference to a DTD
or to an XML Schema.
A Simple XML Document
Look at this simple XML document called “Email.
xml”:
<?xml version=”1.0"?>
<E-mail>
<To>Rohan</To>
<From>Amit</From>
<Subject>Surprise....</Subject>
<Body>Be ready for a cruise...</Body>
</E-mail>
XML Schema
The following example is a XML Schema file called
“E-mail.xsd” that defines the elements of the
XML document above (“E-mail.xml”):
<?xml version=”1.0"?>
<xs:schema xmlns:xs=”http://
www.w3.org/2001/XMLSchema”
targetNamespace=”http://
www.roseindia.net”
xmlns=”http://www.roseindia.net”
elementFormDefault=”qualified”>
<xs:element name=”E-mail”>
<xs:complexType>
<xs:sequence>
<xs:element name=”To” type=”xs:string”/
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<xs:element name=”From”
type=”xs:string”/>
<xs:element name=”Subject”
type=”xs:string”/>
<xs:element name=”Body”
type=”xs:string”/>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:schema>
We will discuss the building blocks of this
schema latter in this section further.
Add a reference to the above-declared XML
document
Now this XML document (E-mail.xml) has a
reference to above-declared XML Schema (Email.
xsd).
<?xml version=”1.0"?>
<E-mail
xmlns=”http://www.roseindia.net”
xmlns:xsi=”http://www.w3.org/2001/
XMLSchema”
xsi:schemaLocation=”http://
www.roseindia.net/Schema E-mail.xsd”>
<To>Rohan</To>
<From>Amit</From>
<Subject>Surprise....</Subject>
<Body>Be ready for a cruise...</Body>
</E-mail>
In the above xml document xmlns declares the
XML namespaces.
Save E-mail.xml and E-mail.xsd in the same
location. Open the file E-mail.xml in a webbrowser.
You will see the following: |
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Feb 2008 | Java Jazz Up | 17 |
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