* `add_depends($page, $spec, links => 1, presence => 1)`
adds a links + presence dependency.
-* `refresh` only rebuilds a page with a links dependency if
- pages matched by the pagespec gain or lose links. (What the link
- actually points to may change independent of this, due to changes
- elsewhere, without it firing.)
+* Use backlinks change code to detect changes to link dependencies too.
* So, brokenlinks can fire whenever any links in any of the
pages it's tracking change, or when pages are added or
removed.
+* To determine if a pagespec is valid to be used with a links dependency,
+ use the same set that are valid for presence dependencies. But also
+ allow `backlinks()` to be used in it, since that matches pages
+ that the page links to, which is just what link dependencies are
+ triggered on.
-TODO: How to determine if a pagespec is valid to be used with a links
-dependency? Use the same simple pagespecs that are valid for presence
-dependencies?
+[[done]]