Hi folks, is there a best-practice for modeling a reference from one document to another? For example is it a good or bad idea to have one document's schema have a "String" field that will contain a Nuxeo UID to another document? I'm aware of Relations in Nuxeo, but i think I need some additional features beyond just a relationship. Specifically, I want to keep multiple references to a document and preserve the order of the linkage.