diff --git a/GalleryNode.php b/GalleryNode.php
index 09d82e0..5857efc 100644
--- a/GalleryNode.php
+++ b/GalleryNode.php
@@ -4,6 +4,9 @@ namespace dokuwiki\plugin\gallery;
 
 use dokuwiki\plugin\prosemirror\parser\Node;
 
+/**
+ * Gallery Node in Prosemirror editor
+ */
 class GalleryNode extends Node
 {
     protected $parent;
@@ -30,12 +33,9 @@ class GalleryNode extends Node
      */
     public function toSyntax()
     {
-        /** @var syntax_plugin_gallery $syntax */
-        $syntax = plugin_load('syntax', 'gallery');
-        $defaults = $syntax->getDataFromParams($syntax->getConf('options'));
-        /** @var action_plugin_gallery_prosemirror $action */
+        /** @var \action_plugin_gallery_prosemirror $action */
         $action = plugin_load('action', 'gallery_prosemirror');
-        $defaults = $action->cleanAttributes($defaults);
+        $defaults = $action->getDefaults();
         $query = [];
         $attrs = $this->data['attrs'];
         if ($attrs['thumbnailsize'] !== $defaults['thumbnailsize']) {
diff --git a/action/prosemirror.php b/action/prosemirror.php
index 373b29d..316241a 100644
--- a/action/prosemirror.php
+++ b/action/prosemirror.php
@@ -43,25 +43,7 @@ class action_plugin_gallery_prosemirror extends ActionPlugin
     {
         global $JSINFO;
 
-        $options = new Options();
-        $defaults = [
-            'thumbnailsize' => $options->thumbnailWidth . 'x' . $options->thumbnailHeight,
-            'imagesize' => $options->lightboxWidth . 'X' . $options->lightboxHeight,
-            'cache' => $options->cache,
-            'filter' => $options->filter,
-            'showname' => $options->showname,
-            'showtitle' => $options->showtitle,
-            'crop' => $options->crop,
-            'direct' => $options->direct,
-            'reverse' => $options->reverse,
-            'recursive' => $options->recursive,
-            'align' => $options->align,
-            'cols' => $options->columns,
-            'limit' => $options->limit,
-            'offset' => $options->offset,
-            'paginate' => $options->paginate,
-            'sort' => $options->sort,
-        ];
+        $defaults = $this->getDefaults();
 
         if (!isset($JSINFO['plugins'])) {
             $JSINFO['plugins'] = [];
@@ -88,22 +70,24 @@ class action_plugin_gallery_prosemirror extends ActionPlugin
      */
     public function renderFromInstructions(Event $event, $param)
     {
-        if ($event->data['name'] !== 'gallery') {
+        if ($event->data['name'] !== 'gallery_main') {
             return;
         }
         $event->preventDefault();
         $event->stopPropagation();
 
         $node = new Node('dwplugin_gallery');
-        // FIXME we may have to parse the namespace from the original syntax ?
         $data = $event->data['data'];
-        $ns = $data['ns'];
+        // FIXME source can be something other than namespace
+        [$ns, $options] = $data;
 
         if (cleanID($ns) === $ns) {
             $ns = ':' . $ns;
         }
         $node->attr('namespace', $ns);
-        foreach ($data as $name => $value) {
+
+        $attrs = $this->optionsToAttrs($options);
+        foreach ($attrs as $name => $value) {
             $node->attr($name, $value);
         }
         $event->data['renderer']->nodestack->add($node);
@@ -156,4 +140,56 @@ class action_plugin_gallery_prosemirror extends ActionPlugin
         $html = p_render('xhtml', p_get_instructions($syntax), $info);
         echo $html;
     }
+
+    /**
+     * Get default node attributes from gallery Options object
+     *
+     * @return array
+     */
+    public function getDefaults(): array
+    {
+        $options = new Options();
+
+        return [
+            'thumbnailsize' => $options->thumbnailWidth . 'x' . $options->thumbnailHeight,
+            'imagesize' => $options->lightboxWidth . 'X' . $options->lightboxHeight,
+            'cache' => $options->cache,
+            'filter' => $options->filter,
+            'showname' => $options->showname,
+            'showtitle' => $options->showtitle,
+            'crop' => $options->crop,
+            'direct' => $options->direct,
+            'reverse' => $options->reverse,
+            'recursive' => $options->recursive,
+            'align' => $options->align,
+            'cols' => $options->columns,
+            'limit' => $options->limit,
+            'offset' => $options->offset,
+            'paginate' => $options->paginate,
+            'sort' => $options->sort,
+        ];
+    }
+
+    /**
+     * Convert gallery options to node attributes
+     *
+     * @param Options $options
+     * @return array
+     */
+    protected function optionsToAttrs($options)
+    {
+        $attrs = (array)$options;
+
+        $attrs['thumbnailsize'] = $options->thumbnailWidth . 'x' . $options->thumbnailHeight;
+        $attrs['imagesize'] = $options->lightboxWidth . 'X' . $options->lightboxHeight;
+        $attrs['cols'] = $options->columns;
+
+        unset($attrs['thumbnailWidth']);
+        unset($attrs['thumbnailHeight']);
+        unset($attrs['lightboxWidth']);
+        unset($attrs['lightboxHeight']);
+        unset($attrs['columns']);
+
+        return $attrs;
+    }
 }