S. 90 : Double taxation relief-Agreement or Protocol entered into by Government-Enforceable in courts and Tribunals only after appropriate notification-Most favoured nation-No right to invoke most favoured nation clause when third country with which India has entered into Double Taxation Avoidance Agreement was not yet member of organisation for economic co-operation and development at time of entering into such agreement-Most favoured nation clause comes into effect after notification is issued-DTAA-India-France-Netherlands-Switzerland-Words and Phrases-“Is”-Interpretation-Double taxation Avoidance agreements. [S. 90(1), Art. 73]