Metadata editor idea. This is just a dirty sketch that shows how I want to make metaeditor work.

MoinMoin/templates/modify_applet.html

 {% import "forms.html" as forms %}
 {% extends theme("layout.html") %}
+
+{% import form.meta_template as meta_template %}
+{% set meta_editor = meta_template.meta_editor %}
 
 {% set title = _("Modifying %(item_name)s", item_name=item_name) %}
 
 {% block content %}
 <h1>{{ title }}</h1>
 <div class="moin-form">
     {{ gen.form.open(form, method='post', enctype='multipart/form-data') }}
     {{ forms.render_errors(form) }}
     {% block extra_form %}{% endblock %}
     {% block data_editor %}{% endblock %}
     <dl>
-        {{ forms.render_field(gen, form['data_file'], 'file') }}
+        {{ forms.render(form['data_file']) }}
     </dl>
     <pre id="moin-editor-help">{{ help }}</pre>
-    {% block meta_editor %}
-        {% set view_method = item.meta['view_method'] %}
-        {% if view_method == 'blog_entry' %}
-            {% include 'modify_meta_blog_entry.html' %}
-        {% else %}
-            {% include 'modify_meta.html' %}
-        {% endif %}
-    {% endblock %}
+    {{ meta_editor(form) }}
     {{ gen.form.close() }}
 </div>
 {% endblock %}
 
 {% block options_for_javascript %}
     <input type="hidden" id="moin-item-contenttype" value="{{ item.meta['contenttype'] }}" />
 {% endblock %}