Dear Maarten,
What you have to decide is when to start publishing information in 2.1. There is no way to know whether BDIIs have upgraded or not. The only thing we currently publish in the BDII is the version of the bdii package, and this package is not affected here. So at some point you may start publishing GLUE 2.1 and depending on which BDII you query you may see this information or not.
Therefore we need a new BDII release along _with_ the new schema.
As I said in my first reply to Salvatore, we need to release a new version of the glue-schema package, if this is what you mean by "a new BDII release".
No, we also need to increase the BDII version.
To avoid the chaos that would otherwise ensue.
There is no chaos because of this, the chaos remains in any case no matter what you know about what´s installed out there. And in any case, it´s still an assumption to think that because a site upgraded the bdii package it also upgraded the glue-schema package. Maybe a fair assumption, but an assumption after all. Regards, Maria