Let me clarify this text processor classifcation a little further.
Organization is the way content is grouped into coherent units.
Reference is text that acts as a gateway to other, related content. Metadata is like the Z-axis of your documents. It is the information in front of or behind the words on display that makes it possible for your to exploit the content in novel and sophisticated ways. For example, metadata about a publication can be used to automate assembly and publishing. The issues of changes to a set of external links and internal clear text edits are related.