XProc and XML Signature/Encryption

I found this short and recent conversation between Norm Walsh and Frederick
Hirsch.  

http://markmail.org/message/yvtjvzhmm3dlfien

I¹m curious to know if it bore any fruit.  Will the XProc recommendation
include steps for signing and encrypting XML?  Are there plans to add such
steps to Calabash?

TIA,

James Garriss
http://garriss.blogspot.com