[...]
    <AttributeDefinition id="uid" xsi:type="PrincipalName">
        <DisplayName xml:lang="en">User Name</DisplayName>
        <DisplayName xml:lang="de">Nutzerkennung</DisplayName>
        <DisplayDescription xml:lang="en">Local User Id</DisplayDescription>
        <DisplayDescription xml:lang="de">Nutzerkennung der Heimateinrichtung</DisplayDescription>
        <AttributeEncoder xsi:type="SAML2String" name="urn:oid:0.9.2342.19200300.100.1.1" friendlyName="uid" encodeType="false"/>
    </AttributeDefinition>

    <AttributeDefinition id="eduPersonPrincipalName" xsi:type="Scoped" scope="%{idp.scope}">
        <InputAttributeDefinition ref="uid" />
        <DisplayName xml:lang="en">Principal name</DisplayName>
        <DisplayName xml:lang="de">Netz-Id</DisplayName>
        <DisplayDescription xml:lang="en">A unique identifier for a person, mainly for inter-institutional user identification</DisplayDescription>
        <DisplayDescription xml:lang="de">Eindeutige, einrichtungsübergreifende Nutzerkennung</DisplayDescription>
        <AttributeEncoder xsi:type="SAML2ScopedString" name="urn:oid:1.3.6.1.4.1.5923.1.1.1.6" friendlyName="eduPersonPrincipalName" encodeType="false" />
    </AttributeDefinition>
    [...]