SignatureMethod http://www.w3.org/2001/04/xmldsig-more#rsa-sha512

[David Wall]

I am using Java 6 with its bundled XML Digital Signature library, and 
while I noted that there's a DigestMethod.SHA512, there is not 
SignatureMethod.RSA_SHA512, and I'm limited to the older 
SignatureMethod.RSA_SHA1.

Is this supported somehow that I don't understand?  Does the Apache 
Santuario support it in a standard way?  I want to be sure our digital 
signatures are easily portable to other validators especially.

Thanks,
David