- * Allow declaring that a dependency does not encompass the content of a
- page. (By passing content => 0 to add_depends.)
- * pagecount, calendar, postsparkline, progress: Use a contentless dependency,
+ * Allow declaring that a dependency is only affected by page presence
+ or changes to its links.
+ (By passing presence => 1 or links => 1 to add_depends.)
+ * pagecount, calendar, postsparkline, progress: Use a presence dependency,