Both MarshalN and Hobbes have referred to "nongxiang" tie guan yin in recent posts. Using Lew's indispensible Babelcarp and a commercial Chinese wholesaler's website, I think I found a definition or two for this and two other related terms. Since I don't know Chinese, however, and since the terms seem specialized, I seek confirmation or correction of my conclusions, which are as follows:
"Nongxiang" seems to mean "fruity, strong, heavy," or "robust" aroma literally, but in point of fact refers to a more heavily roasted TGY, perhaps over an actual fire.
"Qingxiang" seems to mean "clear" or "floral" aroma literally, but actually designates a lightly oxidized TGY.
"Yunxiang" appears to signify "lingering" aroma, but is applied to TGY that is oxidized more than the average.
So, firstly, is my understanding of these terms essentially correct?
Second, how formal vs impressionistic are these classifications? Further, is a lightly oxidized TGY more oxidized than a heavily oxidixed se zhong? To what extent are these terms reliable descriptions? Or are they more creations of the inscrutable Chinese marketing genius?