sp configuration questions

[Jonathan Sabo]

List,

I'm just getting started with Shibboleth and SAML.  I have a single
web site, www.example.com, and I want to allow multiple identity
providers to authenticate users to the service provider I'm running on
each web server.   I'm running ubuntu with the mod shib2 module.   I'm
curious about the entityId name I should use and whether or not I
would have a single physical and logical service provider that allowed
multiple identity providers to authenticate users to...   Is it
possible to have different URL's used for the different identity
providers within the same logical service provider or do I have to
create a logical service provider for each identity provider that
requires a special url or login page setup?   If there are any example
configs you could point me to with this sort of setup that would be
helpful for me too.

Thanks,

Jonathan