The Buddhism based on these two Tantric scriptures is generally called Mantra-yana by some scholars, from which all other offshoots, such as Vajrayana, kalacakra-yana, Sahaja-yana, ect. Arose in later times, and which has constituted the framework of Chinese and Japanese Esoteric Buddhism. These two scriptures , althouht they are called sutras in the Sanskrit version , are definitely classified as Tantas ( Tibetan: rgyud ) by Tibetans ,because these two sutras have distinctivey Tantric features.