+
+----
+
+Link dependencies:
+
+* `add_depends($page, $spec, links => 1, presence => 1)`
+ adds a links + presence dependency.
+* 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.
+
+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? Seems ok.
+
+[[done]]