1<?xml version="1.0"?>
2<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
3
4 <xs:complexType name="Item" abstract="true">
5  <xs:sequence minOccurs="1" maxOccurs="unbounded">
6    <xs:element name="Name" type="xs:string"/>
7  </xs:sequence>
8 </xs:complexType>
9
10 <xs:complexType name="ItemWithNumber">
11  <xs:complexContent>
12   <xs:extension base="Item">
13    <xs:sequence>
14     <xs:element name="Number" type="xs:nonNegativeInteger"/>
15    </xs:sequence>
16   </xs:extension>
17  </xs:complexContent>
18 </xs:complexType>
19
20 <xs:element name="ItemsList">
21  <xs:complexType>
22   <xs:sequence>
23    <xs:element name="Item" type="Item" maxOccurs="unbounded"/>
24   </xs:sequence>
25  </xs:complexType>
26 </xs:element>
27</xs:schema>
28