probins/openlayers — comment on commit 351b7000330c221412252cfe5525e704b8e5c3c6
File: lib/OpenLayers/Protocol/Script.js line 215
By ahocevar:

If you implement my suggestion with the template here, application developers could choose "OpenLayers.Protocol.Script.registry.${id}" or "OpenLayers.Protocol.Script.registry['${id}']" (which are just two different notations for the same), depending on what their server supports.