How can I get the XS session ID?

Hi all,

I'm trying to determine the authentication method used for the current XS session user. Apart from the "samlUserInfo" property, there's no indication of the authentication method on the $.session object.  I found that the M_XS_SESSIONS table contains this info, but i'm not sure how to get the "XS_SESSION_ID" field in order to look up the record corresponding to the current user. 

Any suggestions?  We have HANA SPS10.

Thanks,

Charles