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| XML Schema |
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XMLSchema-instance”
you can use the schemaLocation attribute. This
attribute has two values. The first value is the
namespace to use. The second value is the
location of the XML schema to use for that
namespace:
xsi:schemaLocation=”http://www.roseindia.net
note.xsd”
XSD Simple Elements
XML Schemas define the elements of XML files.
XML simple element contains only text not even
any other elements or attributes.But the text
can be of many different types. It can be among
the types included in the XML Schema definition
(boolean, string, date, etc.), or it may be a
custom type that a user is free to define. Even.
Restrictions (facets) can be added to a data
type in order to limit its content.
Defining a Simple Element
The syntax for a simple element is:
<xs:element name=”aaa” type=”bbb”/>
where aaa is the name of the element and bbb is the data type of the element.
XML Schema has a lot of built-in data types.
The most common types are:
• xs:string
• xs:decimal
• xs:integer
• xs:Boolean
• xs:date
• xs:time
Example:
Few of XML elements:
<name>Rahul</name>
<age>15</age>
<currentdate>2007-05-15</currentdate>
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The corresponding simple element
definitions:
<xs:element name=”name” type=”xs:string”/
>
<xs:element name=”age” type=”xs:integer”/
>
<xs:element name=”currentdate”
type=”xs:date”/>
Default Values for Simple Elements
Simple elements may have a specified default
value OR a fixed specified value .A default value
is automatically assigned to the element when
no other value is specified for example to set
the “orange” default value.
<xs:element name=”fruit” type=”xs:string”
default=”orange”/>
Fixed Values for Simple Elements
A fixed value is also automatically assigned to
the element, and it cannot further specify
another value.
In the following example the fixed value is“apple”:
<xs:element name=”fruit” type=”xs:string”
fixed=”apple”/>
XSD Complex Elements:
A complex element contains other elements or
attributes.
What is a Complex Element?
It is an XML element that contains other
elements and/or attributes. They are of four
types:
• empty elements
• elements that contain only other
elements
• elements that contain only text
• elements that contain both other
elements and text |
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Feb
2008 | Java Jazz Up | 20 |
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