XNA game port to iOS (unable to load data description project assembly in pipeline tool)

So I’ve got this 4 years old game I want to port to iOS. The game was created in XNA and consists of 3 projects: game project, content project and data description project (used to deserialize xmls from content project). Now when I try to build the content in Pipeline tool I get error with loading the data description project dll. It seems that xna based assembly is no longer compatible with monogame. So the question is: Do I have to convert my xna project monogame project to be able to compile assets to ios or is there a way to use Pipeline tool with original xna assembly?

Make a regular class library that references MonoGame, then the content pipeline will be able to use it.

Well, that was easy:). Thank you!