Name	Flags	Card.	Type	Description & Constraints
Signature	TU		Element	A Signature - XML DigSig, JWS, Graphical image of signature, etc. Elements defined in Ancestors: id, extension
type	Σ	1..*	Coding	Indication of the reason the entity signed the object(s) Signature Type Codes ( Preferred)
when	Σ	1..1	instant	When the signature was created
who	Σ	1..1	Reference( Practitioner | PractitionerRole | RelatedPerson | Patient | Device | Organization)	Who signed
onBehalfOf	Σ	0..1	Reference( Practitioner | PractitionerRole | RelatedPerson | Patient | Device | Organization)	The party represented
targetFormat		0..1	code	The technical format of the signed resources MimeType ( Required)
sigFormat		0..1	code	The technical format of the signature MimeType ( Required)
data		0..1	base64Binary	The actual signature content (XML DigSig. JWS, picture, etc.)
Documentation for this format