<<< Here's the <wind> part of the weather report:


This time, we'll make the specification for the sub-elements of <wind> in a separate location. We'll create a complex type named WindType so that our schema can use it like this:

    <element name="wind" type="ewe:WindType"/>

In our definition of WindType, we need to validate that the <direction> is one of the sixteen compass directions. The XML Schema <enumeration> element lets us do exactly that.

    <simpleType name="DirectionType" base="string">
        <enumeration value="N"/>
        <enumeration value="NNE"/>
        <enumeration value="NE"/>
        <enumeration value="ENE"/>
        <!-- and so on ... -->

To complete our defintion for WindType, we add the <speed> element and require it to be an integer greater than or equal to zero.

    <complexType name="WindType">
        <element name="direction" type="ewe:DirectionType"/>
        <element name="speed" type="nonNegativeInteger"/>

On the next page, you can see the entire schema. >>>

  1. Validating XML with XML Schema
  2. Validity and the DTD
  3. Validity and the Schema
  4. Specifying Elements
  5. Making Validation More Specific
  6. Making New Types
  7. Enumerations
  8. The Big Picture
  9. Summary