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Designing Your own XML Schema: Restrictions and User Defined Types


This is the third article in a series which guides you in designing XML Schemas. Hopefully this series will take you from the most basic ideas to the more advanced topics without any hurdles.

Author Info:
By: Jagadish Chaterjee
Rating: 5 stars5 stars5 stars5 stars5 stars / 11
March 20, 2006
TABLE OF CONTENTS:
  1. · Designing Your own XML Schema: Restrictions and User Defined Types
  2. · Restrictions based on patterns in XML Schema
  3. · How to define your own simple type (user-defined data type) in XML Schema
  4. · Understanding the user-defined simple type in XML Schema
  5. · User-defined Simple Type with enumeration in XML Schema
  6. · Understanding the simple type with enumeration in XML Schema
  7. · User-defined Complex Type in XML Schema

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Designing Your own XML Schema: Restrictions and User Defined Types - User-defined Complex Type in XML Schema
(Page 7 of 7 )

In the previous sections, we dealt only with simple user-defined types.  Now, we shall deal with the user-defined complex type.

Let us consider that I would like to define my own data type called “AddressType,” which holds Street, City and Zip elements.  After defining “AddressType,” I would like to use it with two elements, “ResAddress” (residential address) and “OffAddress” (Office Address) as part of the “Employee” definition.  The following listing of a complete XML Schema does the same:

<?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>
              <xs:element name="Name" type="xs:string" />
              <xs:element name="ResAddress" type="AddressType" />
              <xs:element name="OffAddress" type="AddressType" />
            </xs:sequence>
          </xs:complexType>
        </xs:element>
      </xs:sequence>
    </xs:complexType>
    <xs:key name="PK_Employee_ID">
      <xs:selector xpath=".//Employee" />
      <xs:field xpath="ID" />
    </xs:key>
  </xs:element>
  <xs:complexType name="AddressType">
    <xs:sequence>
      <xs:element name="Street" type="xs:string" />
      <xs:element name="City" type="xs:string" />
      <xs:element name="zip" type="xs:string" />
    </xs:sequence>
  </xs:complexType>
</xs:schema>

Any comments, suggestions, feedback, bugs, errors are highly appreciated at jag_chat@yahoo.com


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