diff --git a/grammars/mediawiki.js b/grammars/mediawiki.js
index 25800db..e03b967 100644
--- a/grammars/mediawiki.js
+++ b/grammars/mediawiki.js
@@ -294,5 +294,17 @@ mediawiki = rr.Parser({
       rr.ZeroOrMore(rr.Ref('paragraph')),
       rr.EndOfText()))
 }, [
-  rr.SplitTagAndNest('bi', ['b', 'i'])
+  rr.SplitTagAndNest('bi', ['b', 'i']),
+  rr.GroupSiblings('ul', ['ulli1', 'ulli2', 'ulli3']),
+  rr.GroupSiblings('ul', ['ulli2', 'ulli3']),
+  rr.GroupSiblings('ul', ['ulli3']),
+  rr.RenameTag('ulli1', 'li'),
+  rr.RenameTag('ulli2', 'li'),
+  rr.RenameTag('ulli3', 'li'),
+  rr.GroupSiblings('ol', ['olli1', 'olli2', 'olli3']),
+  rr.GroupSiblings('ol', ['olli2', 'olli3']),
+  rr.GroupSiblings('ol', ['olli3']),
+  rr.RenameTag('olli1', 'li'),
+  rr.RenameTag('olli2', 'li'),
+  rr.RenameTag('olli3', 'li')
 ]);
diff --git a/recentrunes.js b/recentrunes.js
index 91fddae..90d9d87 100644
--- a/recentrunes.js
+++ b/recentrunes.js
@@ -424,7 +424,7 @@ rr.Or_.prototype.match = function(context) {
  * @return {rr.Or_}
  */
 rr.Or = function() {
-  return new rr.Or_(Array.prototype.slice.call(arguments, 0));
+  return new rr.Or_(Array.prototype.slice.call(arguments));
 };
 
 
@@ -725,6 +725,48 @@ rr.SingleLineText = function() {
 /* ============ Filter factories ============ */
 
 
+/**
+ * @param {string} parentName
+ * @param {string} childNames
+ * @return {rr.typeFilter}
+ */
+rr.GroupSiblings = function(parentName, childNames) {
+  return function(node) {
+    if (childNames.indexOf(node.nodeName.toLowerCase()) == -1) {
+      return;
+    }
+    if (node.previousSibling &&
+        node.previousSibling.nodeName.toLowerCase() == parentName) {
+      // Group with previous node.
+      node.previousSibling.appendChild(node);
+      return;
+    }
+    var newNode = document.createElement(parentName);
+    node.parentNode.replaceChild(newNode, node);
+    newNode.appendChild(node);
+  };
+};
+
+
+/**
+ * @param {string} oldName
+ * @param {string} newName
+ * @return {rr.typeFilter}
+ */
+rr.RenameTag = function(oldName, newName) {
+  return function(node) {
+    if (node.nodeName.toLowerCase() != oldName) {
+      return;
+    }
+    var newNode = document.createElement(newName);
+    for (var i = 0; i < node.childNodes.length; i++) {
+      newNode.appendChild(node.childNodes[i]);
+    }
+    node.parentNode.replaceChild(newNode, node);
+  };
+};
+
+
 /**
  * @param {string} originalName
  * @param {Array.<string>} newNames
@@ -759,14 +801,24 @@ rr.SplitTagAndNest = function(originalName, newNames) {
 
 /**
  * @param {Node} node
- * @param {Object.<string, rr.typeFilter>} filters
+ * @param {rr.typeFilter} filter
+ */
+rr.ApplyFilter = function(node, filter) {
+  filter(node);
+  var children = Array.prototype.slice.call(node.childNodes);
+  for (var i = 0; i < children.length; i++) {
+    rr.ApplyFilter(children[i], filter);
+  }
+};
+
+
+/**
+ * @param {Node} node
+ * @param {Array.<rr.typeFilter>} filters
  */
 rr.ApplyFilters = function(node, filters) {
   for (var i = 0; i < filters.length; i++) {
-    filters[i](node);
-  }
-  for (var i = 0; i < node.childNodes.length; i++) {
-    rr.ApplyFilters(node.childNodes[i], filters);
+    rr.ApplyFilter(node, filters[i]);
   }
 };
 
@@ -863,7 +915,7 @@ rr.Context.prototype.advance = function(numChars) {
  * @constructor
  *
  * @param {Object.<string, rr.typeMatcher>} rules
- * @param {Object.<string, rr.typeFilter>} filters
+ * @param {Array.<rr.typeFilter>} filters
  * @private
  */
 rr.Parser_ = function(rules, filters) {
@@ -891,7 +943,7 @@ rr.Parser_.prototype.parseFromString = function(input) {
 
 /**
  * @param {Object.<string, rr.typeMatcher>} rules
- * @param {Object.<string, rr.typeFilter>} filters
+ * @param {Array.<rr.typeFilter>} filters
  * @return {rr.Parser_}
  */
 rr.Parser = function(rules, filters) {
diff --git a/test.js b/test.js
index bb45546..202327d 100644
--- a/test.js
+++ b/test.js
@@ -49,9 +49,9 @@ QUnit.test('Base', function(assert) {
     '&lt;pre&gt;interrupting cow style.&lt;/pre&gt;<blockquote>This is a ',
     'blockquote</blockquote></p><p><h2>Header 2</h2><h3>Header 3 <i>with ',
     'italics</i></h3><h4>Header 4</h4><h5>Header 5</h5><h6>Header 6</h6><hr>',
-    '<ulli1>Item 1a</ulli1><ulli1>Item 1b</ulli1><ulli2>Item 2</ulli2><ulli3>',
-    'Item 3</ulli3><ulli1>Item 1c</ulli1><olli1>Item 1a</olli1><olli1>Item 1b',
-    '</olli1><olli2>Item 2</olli2><olli3>Item 3</olli3><olli1>Item 1c</olli1>',
+    '<ul><li>Item 1a</li><li>Item 1b</li><ul><li>Item 2</li><ul><li>Item 3',
+    '</li></ul></ul><li>Item 1c</li></ul><ol><li>Item 1a</li><li>Item 1b</li>',
+    '<ol><li>Item 2</li><ol><li>Item 3</li></ol></ol><li>Item 1c</li></ol>',
     "<def>I don't really understand what a definition is</def><blockquote>",
     'But blockquotes are easy</blockquote><blockquote2>Even larger ones',
     '</blockquote2><blockquote5>And really huge ones</blockquote5><pre>This ',