I just see a similar issue in the rolling stock scheme:
<xs:complexType name="LineClassification">
<xs:annotation>
<xs:documentation>load limit with respect to line classification (permissible axle load and meter load)</xs:documentation>
</xs:annotation>
<xs:sequence>
<xs:element name="designator" type="rail3:Designator" minOccurs="1" maxOccurs="1">
<xs:annotation>
<xs:documentation>name of the line class according to RIV or other register</xs:documentation>
</xs:annotation>
</xs:element>
</xs:sequence>