Query Tags are driven by a SQL query. The SQL syntax is dictated by the database used, not any special Ignition format.
See QR Code.
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A commonly used object in Ignition that incorporates the value of a tag or property, in addition to some meta data associated with the value. Composed of three parts: a value, a quality code of the value, and timestamp the value was taken
An representation of a distinct quality value - defined by a level (Good, Bad, Uncertain, Error) and a unique code. Has methods like isGood(), isBad(), and isError() available to drive logic.