Query data from Traceability Information Exchange (TIX) is done from the GTNet Query Interface (GQI) API. The API is described in a separate document, the GTNet Query Interface Guide and in the GQI API documentation. GQI provides endpoints for both Representational State Transfer (REST) and Simple Object Access Protocol (SOAP) queries.
GQI API documentation: {tix-instance}/gqi3/index.html