DITA v1.2 Review | @keys in a conref

I am not able to identify the use of @keys at an element that is actually a conref.
In case of a conref, the @href may be generally missing as that shall be derived from the referenced element.

  Say for example, in a map there is topicref element which is actually a conref to a topicref element in another map.

  In map1.ditamap:

  <map>

  …….

  <topicref id=”tr-01” keys=”TR01” href=”abc.dita”/>

  …….

  </map>

  In map2.ditamap:

  <map>

  …….

  <topicref id=”tr-02” keys=”TR02” conref=”map1.ditamap#tr-01”/>

  …….

  </map>

  What shall the key TR02 resolve to? As I understand, that resolves to nothing.

  Also, is there any specific use of such a key in a conref element, apart from defining a key that points to nothing.
I am not ruling out the cases where such an element carries an @href as well.
But in that case, the purpose of conref is undermined.

  Regards,

  Tarun Garg | Adobe Systems | +91-120-2444711 |