Add machine-readable pagination using HTML4.01 `<link rel="next">`, etc.

These extra `<link>` elements only appear on pages where pagination
makes sense. They trigger functionality in some user agents, such as
Opera's Navigation Bar for more easily navigating forward and backwards
across a paged set of notices, messages, or group lists, etc.

1 files changed, 14 insertions, 0 deletions

diff --git a/lib/action.php b/lib/action.php
index c4172ada1..ab51d0252 100644
--- a/lib/action.php
+++ b/lib/action.php
@@ -111,6 +111,7 @@ class Action extends HTMLOutputter // lawsuit
         $this->showTitle();
         $this->showStylesheets();
         $this->showScripts();
+        $this->showRelationshipLinks();
         $this->showOpenSearch();
         $this->showFeeds();
         $this->showDescription();
@@ -194,6 +195,19 @@ class Action extends HTMLOutputter // lawsuit
     }
 
     /**
+     * Show document relationship links
+     *
+     * SHOULD overload
+     *
+     * @return nothing
+     */
+    function showRelationshipLinks()
+    {
+        // output <link> elements with appropriate HTML4.01 link types:
+        // http://www.w3.org/TR/html401/types.html#type-links
+    }
+
+    /**
      * Show OpenSearch headers
      *
      * @return nothing