[Name] typeexpr [Required] false [Attribute Constraints] Must not occur with the 'type' attribute. [Type] value expression [Valid Values] Any value expression that evaluates to a URI that would be a valid value for 'type'. [Description] A dynamic alternative to 'type'. If this attribute is present, the SCXML Processor MUST evaluate it when the parent element is evaluated and treat the result as if it had been entered as the value of 'type'. [Default Value] 
none
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