to the main page about the tutorial  THE XML REVOLUTION  -  TECHNOLOGIES FOR THE FUTURE WEB back up next

A larger example

A XML Schema description of our recipe collections, recipes.xsd: 

<schema xmlns="http://www.w3.org/2001/XMLSchema"
        xmlns:r="http://recipes.org"
        targetNamespace="http://recipes.org"
        elementFormDefault="qualified">

  <element name="collection">
    <complexType>
      <sequence>
        <element name="description" type="r:anycontent"/>
        <element ref="r:recipe" minOccurs="0" maxOccurs="unbounded"/> 
      </sequence>
    </complexType>
  </element>

  <complexType name="anycontent" mixed="true">
    <sequence>
      <any minOccurs="0" maxOccurs="unbounded" 
           processContents="skip" namespace="##other"/>
    </sequence>
  </complexType>

  <element name="recipe">
    <complexType>
      <sequence>
        <element name="title" type="string"/>
        <element ref="r:ingredient" minOccurs="0" maxOccurs="unbounded"/>
        <element ref="r:preparation"/>
        <element name="comment" minOccurs="0" type="string"/>
        <element name="nutrition">
          <complexType>
            <attribute name="protein" type="r:nonNegativeDecimal" use="required"/>
            <attribute name="carbohydrates" type="r:nonNegativeDecimal" use="required"/>
            <attribute name="fat" type="r:nonNegativeDecimal" use="required"/>
            <attribute name="calories" type="r:nonNegativeDecimal" use="required"/>
            <attribute name="alcohol" type="r:nonNegativeDecimal" use="optional"/>
          </complexType>
        </element>
      </sequence>
    </complexType>
  </element>

  <element name="preparation">
    <complexType>
      <sequence>
        <element name="step" type="string" minOccurs="0" maxOccurs="unbounded"/>
      </sequence>
    </complexType>
  </element>

  <element name="ingredient">
    <complexType>
      <sequence>
        <element ref="r:ingredient" minOccurs="0" maxOccurs="unbounded"/>
        <element ref="r:preparation" minOccurs="0"/>
      </sequence>
      <attribute name="name" use="required"/>
      <attribute name="amount" use="optional">
        <simpleType>
          <union>
            <simpleType>
              <restriction base="string">
                <enumeration value="*"/>
              </restriction>
            </simpleType>
            <simpleType>
              <restriction base="r:nonNegativeDecimal"/>
            </simpleType>
          </union>
        </simpleType>
      </attribute>
      <attribute name="unit" use="optional"/>
    </complexType>
  </element>

  <simpleType name="nonNegativeDecimal">
    <restriction base="decimal">
      <minInclusive value="0"/>
    </restriction>
  </simpleType>

</schema>

Note that:


By inserting the following reference into the root element: 

<collection xmlns="http://recipes.org"
            xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
            xsi:schemaLocation="http://recipes.org recipes.xsd">
  ...
</collection>

in our recipe collection recipes.xml, we state that the document is intended to be valid according to recipes.xsd.

back COPYRIGHT © 2000-2003 ANDERS MØLLER & MICHAEL I. SCHWARTZBACH next