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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
(Page 1 of 7 )

If you are new to XML Schema, I strongly suggest you to go through my first article in the same series, which you can find here

Restricting the digits in an XML Schema

As, I already explained various aspects of XML Schemas, including their definition, simple types and complex types, restrictions and so forth in my previous articles, I shall not repeat them again in this article. 

Let us consider that we would like to have any employee's salary to be restricted to only certain digits (towards both precision and scale).  This is possible with an existing schema type, “decimal.”  Let us look at the following complete schema:

<?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="Salary">
                <xs:simpleType>
                  <xs:restriction base="xs:decimal">
                    <xs:totalDigits value="7" />
                    <xs:fractionDigits value="2" />
                  </xs:restriction>
                </xs:simpleType>
              </xs:element>
            </xs:sequence>
          </xs:complexType>
        </xs:element>
      </xs:sequence>
    </xs:complexType>
  </xs:element>
</xs:schema>

You need to observe the following fragment within the above complete schema, which actually does the restriction:

<xs:element name="Salary">
  <xs:simpleType>
    <xs:restriction base="xs:decimal">
      <xs:totalDigits value="7" />
      <xs:fractionDigits value="2" />
    </xs:restriction>
  </xs:simpleType>
</xs:element>

The most important parts are the “totalDigits” and “fractionDigitis” which do our restriction.


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