[neilv]

Yep, I've implemented SAML multiple times with a purpose-built processing.

And I implemented a non-SAML use of XML-DSIG standards, and discovered, when attempting to interoperate, that a major platform vendor's implementation of wasn't compliant, such that hashes would only be correct using that vendor's implementation (which I initially assumed was a mistake of mine, until an expert confirmed the major vendor was actually wrong).