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| XML Schema |
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<To>Rohan</To>
XML-parsers-API
Feb-08 Java Jazz Up 21
<From>Amit</From>
<Subject>Surprise....</Subject>
<Body>Be ready for a cruise...</Body>
</E-mail>
Building blocks of a XML-Schema
XSD - The <schema> Element
The <schema> element is the root element
of every XML Schema:
<?xml version=”1.0"?>
<xs:schema>
...
...
</xs:schema>
The <schema> element may contain some
attributes like...
<?xml version=”1.0"?>
<xs:schema xmlns:xs=”http://http://
www.w3.org/2001/XMLSchema”
targetNamespace=”http://www.roseindia.net”
xmlns=”http://www.roseindia.net”
elementFormDefault=”qualified”>
...
...
</xs:schema>
The following code:
xmlns:xs=”http://www.w3.org/2001/
XMLSchema”
indicates that the elements and data types used
in the schema come from the “http://
www.w3.org/2001/XMLSchema” namespace. It
also specifies that the elements and data types
that come from the “http://www.w3.org/2001/
XMLSchema” namespace should be prefixed with
xs:
This code segment
targetNamespace=”http://www.roseindia.net”
indicates that the elements defined by this
schema (E-mail, To, From, Subject, Body.) come from the “http://www.roseindia.net”
namespace.
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This fragment:
xmlns=”http://www.roseindia.net”
indicates that the default namespace is
“http:/
/www.roseindia.net”.
This fragment:
elementFormDefault=”qualified”
indicates that any elements used by the XML
instance document which were declared in this
schema must be a namespace qualified.
Referencing a Schema in an XML Document
This XML document (E-mail.xml) has a reference
to an XML Schema (E-mail.xsd).
<?xml version=”1.0"?>
<E-mail
xmlns=”http://www.roseindia.net”
xmlns:xsi=”http://www.w3.org/2001/
XMLSchema”
x s i : s c h e m a L o c a t i o n = ” h t t p : / /
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>
The following fragment:
xmlns=”http://www.roseindia.net”
Specifies the default namespace declaration.
This declaration tells the schema-validator that
all the elements used in this XML document are
declared in the “http://www.w3schools.com”
namespace.
Once you have the XML Schema Instance
namespace available:
xmlns:xsi=”http://www.w3.org/2001/ |
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Feb 2008 | Java Jazz Up | 19 |
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