To give a specific answer, we'd probably have to take note of the question and provide more specificity down the road, but basically investments are categorized in those three main categories in the Chinese inward investment law. There are those that are encouraged, those that are restricted, and those that are prohibited. By way of adding to the example I gave of those that are prohibited, I'll see if one of my colleagues can elaborate.
I can tell you that oil and gas investments fall mainly into the encouraged category and so face a less restrictive policy regime than mining. Basically, it has to do with the level of screening procedures. Depending upon the category, there would be a higher threshold to meet for the inward screening mechanisms.