input: [Attribute] Read [Writeable] Yes [Required] No [Description] If false, the message has not been flagged as "read" by the current user. [Data Type] 
output: Boolean
options: C h a r a c t e r
options: T i m e s t a m p
options: B o o l e a n
options: C h a r a c t e r L i s t
options: E x p a n s i o n