ngground.translation.OptRestriction.pairRestriction.Y2" class="extype">Y2</span>[<span name="provingground.translation.OptRestriction.&lt;refinement&gt;.Y.&lt;local Y&gt;.A" class="extype">A</span>])]</span></span></li><li class="indented0 " name="provingground.translation.OptRestriction#subtypRestriction" group="Ungrouped" fullComment="no" data-isabs="false" visbl="pub"><a id="subtypRestriction[X[_],Y[_]&gt;:X[_]]:provingground.translation.OptRestriction[X,Y]"></a><a id="subtypRestriction[X[_],Y[_]&gt;:X[_