XCode - 编辑xcodeproj包（特别是project.pbxproj）

I'm working in XCode and I've also written an external editor tool that generates resources for use in the project. In the best case scenario, the tool would edit the project.pbxproj file so that it includes the generated resources in the project. I've read through the file in an attempt to understand it, and it's mostly discernible but there is still one major question I have.I'm working in XCode and I've also written an e