<linkType id="linka2b" constrained="false" internal="false">
    <source>
            <endpoint multiplicity="0..1" displayName="b" id="link.a2b.b">
                    <itemReferenceType itemTypeName="WorkItem" packageURI="com.ibm.team.workitem">
                    </itemReferenceType>
                </endpoint>
        </source>
        <target >
            <endpoint multiplicity="0..n" displayName="a" id="link.a2b.a">
                    <itemReferenceType itemTypeName="WorkItem" packageURI="com.ibm.team.workitem">
                    </itemReferenceType>
                </endpoint>
        </target>
</linkType>