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constant

A string constant. The string may not include an expression

name="fooMethod"

constant+expr

A string constant. The string may include an expression, but an expression-only string is not allowed

default="${foo}Method"

expression

A UEL expression without enclosing brackets

from="item.quantity * item.priceEach"

${expression}

A UEL expression with enclosing brackets

default="${parameters.itemId}"

script

A short script ("scriptlet")

script="groovy:foo.bar();"