specifying logout endpojnt at the IDP

[Steven Carmody]

Is there a 'standard" way that an IDP could expose, via metadata, a 
logout endpoint ? I know that currently the standard supported IDP 
implementation does not support this functionality; however, there are 
several unsupoprted approaches that are available ....

Presumably, an SP, if it so desired, could complete its own logout 
sequence by redirecting to this url at an IDP ....

thanks!