1<xs:schema xmlns:tns="http://myns"
2        targetNamespace="http://myns"
3        xmlns:xs="http://www.w3.org/2001/XMLSchema"
4>
5
6  <xs:element name="a" />
7
8  <xs:complexType name="c" >
9        <xs:sequence minOccurs="2" maxOccurs="4">
10             <xs:sequence minOccurs="19" maxOccurs="20">
11                  <xs:element ref="tns:a" />
12             </xs:sequence>
13        </xs:sequence>
14  </xs:complexType>
15
16  <xs:element name="c" type="tns:c" />
17
18</xs:schema>
19