| in HTML, a reference can be either a URL or a relative URL followed
| optionally by an anchor; the interpretation of the anchor is only
| defined if the URL (or partial URL) refers to a HTML 2.0 document, and
and Terry Allen asked:
> Did you mean "fragment identifier"? a URL may point to anything,
> not just an HTML 2.0 doc.
and indeed, I did; I typed `anchor' where I should have written
`fragment identifier'.