Using the XML Schema Infoset Model APIs and adding on to the schema created in Exercise 4: Create a global complex type with a sequence model group, create the following schema document:

<?xml version="1.0"?>
<schema
  targetNamespace="http://www.eclipse.org/xsd/examples/po"
  xmlns="http://www.w3.org/2001/XMLSchema"
  xmlns:po="http://www.eclipse.org/xsd/examples/po">
 
  <simpleType name="USState">
    <restriction base="string">
      <enumeration value="AK"/>
      <enumeration value="AL"/>
      <enumeration value="AR"/>
    </restriction>
  </simpleType>
   
  <simpleType>
    <list itemType="po:USState"/>
  </simpleType>
   
  <complexType name="PurchaseOrderType">
    <sequence>
      <element minOccurs="0" name="state" type="po:USState"/>
      <element ref="po:notes"/>
    </sequence>
  </complexType>
   
  <element name="notes" type="string"/>
</schema>
                                

Hint: You will need to create an org.eclipse.xsd.XSDParticle for the local element and element reference.

New constructs created in this exercise:

• <element> - Global element with name="notes" and type="string"
• <element> - Local element with name="state", type="po:USState" and minOccurs="0"
• <element> - Element reference with ref="po:notes"