opensaml doxygen documentation?

[Brendan Miller]

There's an opensaml manual with some examples here:
https://wiki.shibboleth.net/confluence/display/OpenSAML/OSTwoUserManual

but where is the comprehensive API documentation? Are there doxygen
docs or something similar online somewhere?

My other question is if you are writing a service provider that needs
to integrate with a pre-existing SAML identity provider, is there any
reason to use shiboleth vs opensaml? I'm unclear on what shibboleth
adds to opensaml.

Thanks,
Brendan