Understanding and Creating Xcode XML Layouts

Question

I like to fully understand the generated XML file from the Xcode storyboard. So that I can create the file myself. Unfortunately, I cannot find a good link from Apple on how to do this. And after that, is there a way to automatically create a storyboard from an XML file?

Answer your question: I am currently working on a project where I need to create an XML file from external Xcode and load this XML file through the API in an application that creates a new view

Thanks in advance!