sentences:  Some countries have signed either the ATA Convention or the Istanbul Convention but have yet to appoint a National Guaranteeing Association to start officially issuing ATA Carnets.Also in some cases, despite not having signed a given Convention or Annex, the according type of goods will be accepted by some countries under their national law.China, for example, while not having signed Annex B6 regarding sporting equipment, will nonetheless accept temporary importation for these goods under its national laws.