Last sentence: "It is repository-specific whether paths are exposed for folders only or also for non-folder file-able objects."

What does this mean? I see two options (it is ambiguous):

1. Paths may be exposed for non-folder objects? If so, how (cmis:path? - no, should not add folder properties to documents. custom extension? - meaningless because you can do anything with an extension. custom property? - meaningless because of course you can add custom properties)
2. Paths do not need to be exposed on non-folder properties. This means that non-folders don't have to include the pathSegment? That it is optional to support getObjectByPath for documents?