A.6.6:4.4.1 - Perspective and voice

State the relation in the shortest ordinary sentence that keeps both participants and direction recoverable: TC-17 is calibrated to ITS-90 is valid. Functional or arrow notation may be added when it helps a formal receiver; it is not the default. Base-view wording is also valid when it preserves the same relation and direction. Do not turn B validates X into an inverse relation unless that inverse is independently defined.