2 <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
4 <xs:complexType name="Item" abstract="true">
5 <xs:sequence minOccurs="1" maxOccurs="unbounded">
6 <xs:element name="Name" type="xs:string"/>
10 <xs:complexType name="ItemWithNumber">
12 <xs:extension base="Item">
14 <xs:element name="Number" type="xs:nonNegativeInteger"/>
20 <xs:element name="ItemsList">
23 <xs:element name="Item" type="Item" maxOccurs="unbounded"/>