1  <?xml version="1.0" encoding="ISO-8859-1" ?>
 2  <!-- 3.2.3 : 2.2 
 3      If ref is present, then all of <complexType>, <simpleType>, <key>, <keyref>, <unique>, 
 4      nillable, default, fixed, form, block and type must be absent, i.e. only minOccurs, maxOccurs, 
 5      id are allowed in addition to ref, along with <annotation>.
 6  
 7  -->
 8  <schema xmlns="http://www.w3.org/2001/XMLSchema" targetNamespace="http://foo" xmlns:foo="http://foo">
 9  	
10    <element name="bar" type="string"/>	
11  	
12    <element name="foo">
13    	  <complexType>
14    	  	<choice>
15    	  	
16    	  		<!-- The good ones. -->
17    	  		<element ref="foo:bar" minOccurs="0"/>
18    	  		<element ref="foo:bar" maxOccurs="0"/>
19    	  		<element ref="foo:bar" id="myomy"/>
20    	  		
21    	  		<!-- The bad ones. -->
22    	  		<element ref="foo:bar">
23    	  			<complexType>
24    	  				<attribute name="bar" type="string"/>
25    	  			</complexType>
26    	  		</element>
27    	  		
28    	  		<element ref="foo:bar">
29    	  			<simpleType>
30    	  				<restriction base="string">
31    	  					<maxLength value="20"/>
32    	  				</restriction>
33    	  			</simpleType>
34    	  		</element>  
35    	  		
36    	  		<element ref="foo:bar" type="string"/>
37    	  		<element ref="foo:bar" nillable="true"/>
38    	  		<element ref="foo:bar" default="Joni"/>
39    	  		<element ref="foo:bar" fixed="Mitchel"/>
40    	  		<element ref="foo:bar" form="unqualified"/>
41    	  		<element ref="foo:bar" block="restriction"/>  	  		
42    	  		
43    	  	</choice>
44    	  </complexType>    
45    </element>  
46    
47  
48  </schema>