Attribute attributes

Hey Folks,

I took an action to  distribute a pointer to the work the that the Attribute Exchange working group within OIX on describing quality and origin metrics for attributes

the published paper is here:

http://openidentityexchange.org/wp-content/uploads/2014/06/OIX-AXN-Trust-Framework-Specification-1.0-7-5-2013.pdf

to spare you too much pain - the relevant sections are defined on pag3es 19-21 

--Andrew