<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:tns="http://example.com"
targetNamespace="http://example.com">
<xs:complexType name="BaseType">
<xs:sequence>
<xs:element minOccurs="0" maxOccurs="unbounded" name="a" type="xs:string" />
<xs:element minOccurs="0" maxOccurs="unbounded" name="b" type="xs:int" />
</xs:sequence>
</xs:complexType>
<xs:complexType name="FirstRestrictedType">
<xs:complexContent>
<xs:restriction base="tns:BaseType">
<xs:sequence>
<xs:element minOccurs="1" maxOccurs="1" name="a" type="xs:string" />
</xs:sequence>
</xs:restriction>
</xs:complexContent>
</xs:complexType>
<xs:complexType name="SecondRestrictedType">
<xs:complexContent>
<xs:restriction base="tns:BaseType">
<xs:sequence>
<xs:element minOccurs="1" maxOccurs="unbounded" name="b" type="xs:int" />
</xs:sequence>
</xs:restriction>
</xs:complexContent>
</xs:complexType>
<xs:complexType name="ThirdRestrictedType">
<xs:complexContent>
<xs:restriction base="tns:SecondRestrictedType">
<xs:sequence>
<xs:element minOccurs="1" maxOccurs="1" name="b" type="xs:int" />
</xs:sequence>
</xs:restriction>
</xs:complexContent>
</xs:complexType>
</xs:schema>