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OTX (Open Test Sequence eXchange) is a standard for the exchange of test sequences between different test equipment and/or organizations. The standard specifies an XML schema that describes how to structure data for test sequences, including stimulus signals and the expected responses from unit under test (UUT). OTX enables interoperability between various testing systems by making sure that a sequence, once defined in one system, can be easily imported into another without requiring manual adjustments. It provides mechanism for sharing best practice tests across industries such as automotive manufacturing where OTX originated.

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