ETSI ES 203 119-3 (V1.5.1) (2021-01)

Methods for Testing and Specification (MTS);
The Test Description Language (TDL);
Exchange Format
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Annex A (normative):
Technical Representation of the TDL XMI Schema
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The TDL XMI Schema is derived from the TDL meta-model implementation provided in Annex A of ETSI ES 203 119-1. 
It is provided as an XML Schema Definition (XSD) document that can serve for the syntactic validation of TDL model instances serialised according to the TDL Exchange Format.