Home arrow XML arrow Page 5 - Designing Your own XML Schema: Learn the Essentials
XML

Designing Your own XML Schema: Learn the Essentials


This is the first article in a series which guides you in designing XML Schemas right from the basics without any hurdles.

Author Info:
By: Jagadish Chaterjee
Rating: 4 stars4 stars4 stars4 stars4 stars / 22
March 06, 2006
TABLE OF CONTENTS:
  1. · Designing Your own XML Schema: Learn the Essentials
  2. · XML Schema: beginning with the simplest way
  3. · XML Schema: the complex way
  4. · XML Schema: a simple practical example
  5. · XML Schema: a simple practical example continued
  6. · XML Schema: a more practical example

print this article
SEARCH DEVARTICLES

Designing Your own XML Schema: Learn the Essentials - XML Schema: a simple practical example continued
(Page 5 of 6 )

In the previous section, I used only one employee detail in the XML document.  Can we have more than one employee provided in the XML document according to the previous schema?  The answer is NO.  By default, every element can occur only once.  We need to make a small modification to the above schema to make it accept a larger number of employee details.  The modification could be as follows:

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" attributeFormDefault="unqualified">
      <xs:element name="Employees">
            <xs:annotation>
                  <xs:documentation>Contains All Employee information</xs:documentation>
            </xs:annotation>
            <xs:complexType>
                  <xs:sequence>
                        <xs:element name="Employee" maxOccurs="unbounded">
                              <xs:complexType>
                                    <xs:sequence>
                                          <xs:element name="ID" type="xs:string"/>
                                          <xs:element name="Name" type="xs:string"/>
                                          <xs:element name="Age" type="xs:int"/>
                                    </xs:sequence>
                              </xs:complexType>
                        </xs:element>
                  </xs:sequence>
            </xs:complexType>
      </xs:element>
</xs:schema>

Now you should observe the word “maxOccurs.”  By default “maxOccurs” is set to 1.  This means you can have only one employee detail provided within the XML document.  Now, we specified “maxOccurs” with “unbounded.”  This means a countless number of employee details can be provided within the XML document.

Let us check this with a sample XML document conforming to the above schema now.

<?xml version="1.0" encoding="UTF-8"?>

<Employees xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="C:\Employees.xsd">
      <Employee>
            <ID>1001</ID>
            <Name>Jag</Name>
            <Age>27</Age>
      </Employee>
      <Employee>
            <ID>1001</ID>
            <Name>Jag</Name>
            <Age>27</Age>
      </Employee>
      <Employee>
            <ID>1003</ID>
            <Name>Dhan</Name>
            <Age>48</Age>
      </Employee>
</Employees>

Now, you can see that I am able to add any number of employees with the above-defined schema.


blog comments powered by Disqus
XML ARTICLES

- Open XML Finally Supported by MS Office
- XML Features Added to Two Systems
- Using Regions with XSL Formatting Objects
- Using XSL Formatting Objects
- More Schematron Features
- Schematron Patterns and Validation
- Using Schematron
- Datatypes and More in RELAX NG
- Providing Options in RELAX NG
- An Introduction to RELAX NG
- Path, Predicates, and XQuery
- Using Predicates with XQuery
- Navigating Input Documents Using Paths
- XML Basics
- Introduction to XPath

Watch our Tech Videos 
Dev Articles Forums 
 RSS  Articles
 RSS  Forums
 RSS  All Feeds
Write For Us 
Weekly Newsletter
 
Developer Updates  
Free Website Content 
Contact Us 
Site Map 
Privacy Policy 
Support 

Developer Shed Affiliates

 




© 2003-2017 by Developer Shed. All rights reserved. DS Cluster - Follow our Sitemap
Popular Web Development Topics
All Web Development Tutorials