To classify the teachings according to theme， time period， etc. Teaching classification was a major aspect of the textual studies of many 5-8th century monks from the scholarly schools of Chinese Buddhism， such as Faxiang 法相， Tiantai 天台 and Huayan 华严. Some of the more famous doctrinal classifiers were Huiyuan， Zhiyi 智顗， Fazang 法藏 and Zongmi 宗密.