Sensor (allow MI_Instrument references) -->
    <div data-dojo-type="esri/dijit/metadata/form/iso/ObjectReference"
      data-dojo-props="target:'gmi:relatedSensor',minOccurs:0,maxOccurs:'unbounded',
        label:'${i18nISO19115.MI_Event.relatedSensorReference}'">
      <div data-dojo-type="esri/dijit/metadata/form/Attribute" data-dojo-props="target:'xlink:href',showHeader:false"></div>
    </div>
    
    <!-- relatedPass (allow MI_PlatformPass reference) 
    <div data-dojo-type="gxe/form/iso/ObjectRefer