This is not the URL inside the responsible party section of the CIM but a separate URL in the component model section:

<modelComponent>
    <onlineResource>
      <gmd:linkage>
        <gmd:URL>http://www.cesm.ucar.edu&lt;/gmd:URL>
      </gmd:linkage>

This was originally requested by NUOPC but may be used by CESM as well

Assign it to hasURL