Indicates whether or not all contributors contributed equally.
If the contributor whom this attribute modifies contributed equally with all other contributors, this attribute should be set to “ yes ”; if his/her contribution was greater or lesser, then this attribute should be set to “ no ”.
|no||This contributor did not participate equally with all other contributors.|
|yes||This contributor participated equally with all other contributors.|
|Restriction: This attribute may be specified if the element is used.|