Links as information: How does this manifest?

Once we accept the notion that links between documents are information, the question remains: how do we capture this information?

The most obvious way to add informational value to a hyperlink is to give the anchor text a description which describes the relationship rather than just the title of the linked document.

Is the link at the top of this document back to its parent a good example of this? I’m not sure.

The next question is: how do we extract meaning from hyperlinks?