1<?xml version="1.0" encoding="ISO-8859-1" ?>
2
3<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
4
5  <xs:element name="foo">
6    <xs:complexType>
7        <xs:choice minOccurs="0" maxOccurs="unbounded">
8        
9          <xs:element name="barA"  >
10            <xs:complexType>            
11              <xs:attribute name="attr" type="xs:string" use="required" />                            
12            </xs:complexType>
13          </xs:element>
14          
15          <xs:element name="barB" >
16            <xs:complexType>
17              <xs:attribute name="attr" type="xs:string" use="optional" />
18            </xs:complexType>  
19          </xs:element>
20          
21          <xs:element name="barC" >
22            <xs:complexType>
23              <xs:attribute name="attr" type="xs:string" use="prohibited" />
24            </xs:complexType>  
25          </xs:element>
26          
27        </xs:choice>
28    </xs:complexType>
29  </xs:element>
30
31</xs:schema>
32
33