[Required] false [Attribute Constraints] Must not occur with the 'idlocation' attribute. [Type] ID [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. [Name] 
id
t y p e
t y p e e x p r
s r c
s r c e x p r
i d
i d l o c a t i o n
n a m e l i s t
a u t o f o r w a r d