Yes, that's right. Huo Xiang Zheng Qi San is characterized as a Wind invasion or Tai Yang formula, which may seem a little wierd given its GI effects. Two things may help explain that:
1. It's also good for muscle aches and pains accompanying acute GI problems. These aches are more familiar symptoms of Wind invasion
2.Wei Qi is distributed not just along the skin, but also along the GI lining, according to the classics. So, some formulas that expel Wei Qi invading pathogens actually act as much internally as externally. This is actually true for a lot of classic Wind Cold formulas. For example, Gui Zhi Tang or Cinnamon Decoction is used for back pain, but is able to be modified to treat abdominal disorders.
So in retrospect, it's not as strange as it might seem.
Yang Ming formulas clear Heat and are bitter, whereas aromatic formulas expel Wind from the Tai Yang. Huo Xiang is actually Patchouli, which most people realize is very fragrant. So that fact alone would tell you it's not a Yang Ming formula.
Anyway, blah, blah, blah. Aren't you glad you asked?
Steve