[Required] false [Attribute Constraints] Must not occur with the 'srcexpr' attribute or the element. [Type] URI [Default Value] None [Valid Values] Any URI. [Description] A URI to be passed to the external service. See below for details. [Name] 
src
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