When is it worth creating an XML Schema (XSD)?

I'm curious of thoughts on how one would want to apply schema to a list of completed projects, for example, a listing of projects that were completed by an architecture firm.

So let's say you have a list of projects that were completed, consisting of information such as the date, location, description, etc.

I don't know if it is necessarily considered a Creative Work, or a place. I'm considering using the general ItemList/Item properties but not sure if there is much value in it. So having said that, would anyone expect this to be beneficial or worth doing?