
sec.privilegeSetRoles( action as String, kind as String, role-names as String[] ) as null
  Assigns the privilege ($action,$kind) to have the roles identified by
  $role-names.  Removes the prviously assigned roles.
  If a privilege identified by ($action,$kind) is not found, an error is 
  returned.
  If a role name in $role-names does not correspond to an existing role,
  an error is returned.
  If $role-names is the empty sequence, all existing roles for the privilege
  are removed.
  If the current user is limited to granting only his/her roles,
  and $role-names is not a subset of the current user's roles, then an error 
  is returned.
  
http://marklogic.com/xdmp/privileges/privilege-set-roles http://marklogic.com/xdmp/privileges/grant-all-roles orhttp://marklogic.com/xdmp/privileges/grant-my-roles
  This function must be executed against the security database.
// execute this against the security database
declareUpdate();  
const sec = require('/MarkLogic/security.xqy');
 
sec.privilegeSetRoles(
    "http://marklogic.com/xdmp/privileges/mypriv", 
     "execute", "Contractor")
// Assigns the privilege with the specified action to the "Contractor" role.
   The privilege is removed from any other roles that had previously been  
   assigned the privilege. 
  
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