[Clause] Signature [Description] Signature and attribution information as defined by the Digital Signature effort [Applies to] Proposal or statement [Required in Every Proposal] no [Default Type of Label] none [May be Defined in Vocabulary] 
yes
y e s
n o
n o , b u t q u a l i f i e r a n d c a t e g o r y c o m p o n e n t s m a y b e