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ExposedFields also define the initial value for the node's state, but are public and may be modified by other nodes.
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Each exposedField attribute has an associated implicit set_ eventIn and _changed eventOut so that exposed fields may be connected using ROUTE statements, and may be read and/or written by Script nodes
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exposedField foo is equivalent to:
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eventIn set_foo # recieves information that then
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field foo # sets a value in this field foo
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eventOUT foo_changed # and generates a foo_changed eventOut
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