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英语高手解释下这句话中as done的用法?

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英语高手解释下这句话中as done的用法?
The terms "folk art" and "intangible cultural heritage," as understood by IOV,are expressed in five broad categories.
首先这句话是正确的,出处:
这句话大概是讲,IOV所理解的术语“民间艺术”和“非物质文化遗产”,主要有5大类.
不大清楚as understood这个用法,显然不是定语从句,从其形式上看,是个非谓语动词结构,或者是省略结构?比如,是as they are understood的省略?
好像见过法律文件中有regulations as stipulated 的用法,也就是说,as done也可以前面不加逗号.
对,
短语
as understood ( = as has/have been understood,...)
as stipulated ( = as has/have been stipulated,...)
as stated ( = as has/have been stated,...)
as previously discussed ( = as has/have been previously discussed,...)
等等
都是省略语
完整(缩短前)的句子一般是括号内的句型 .
例:
As stipulated in the booking agreement,room cancellations are subject to a 25% cancellation charge.
再问: 也就是说,as done其实质就是as 引导的一类非限制性定语从句(as充当关系代词做主语,此时的先行词是后面的主句,从句的谓语是be+done的被动语态结构)这类句子的特殊省略形式:”按照/正如...所...的,”?
再答: 就是 ”按照/正如...所...的“。