[Name] id [Required] false [Attribute Constraints] Must not occur with 'idlocation'. [Default Value] none [Valid Values] Any valid token [Description] A string literal to be used as the identifier for this instance of . See 3.14 IDs for details. [Type] 
xml:ID
E v e n t T y p e . d a t a t y p e
V a l u e e x p r e s s i o n
U R I
v a l u e e x p r e s s i o n
x m l : I D
L o c a t i o n e x p r e s s i o n
D u r a t i o n . d a t a t y p e
L i s t o f l o c a t i o n e x p r e s s i o n s