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What is the main difference between validator and Expression.
Difference between Validator and Expression in Thingworx
The most obvious is that the validator only offers a Boolean output*, whilst the expression can return nearly any data type that Thingworx has to offer. A validator also provides additional event outputs for a True or False result.
*However, you can have other data types than Boolean returned, e.g. by using "Output = "Hi there". This (unfortunately) overwrites the implicit boolean output.
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