1 <?xml version="1.0"?> 2 <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"> 3 <xs:complexType name="A"> 4 <xs:all> 5 <xs:element name="b" type="xs:string" minOccurs="0"/> 6 </xs:all> 7 </xs:complexType> 8 9 <xs:element name="a" type="A"/> 10 </xs:schema> 11
