alfresco - What is the purpose of <role> within association definition in a content model? -

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i noticed within person model (didn't pick on first time):

 <associations>     <association name="cm:avatar">        <source>           <role>cm:avatarof</role> <!-- purpose of this?? -->           <mandatory>false</mandatory>           <many>false</many>        </source>        <target>           <class>cm:content</class>           <role>cm:hasavatar</role>           <mandatory>false</mandatory>           <many>false</many>        </target>     </association>  </associations>

i duplicating association own model , know it's significance of element within associations.

the info informational only, value can retrieved via javascript api. information can found here: https://issues.alfresco.com/jira/browse/mnt-7403


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