Custom Syntax's are now enabled via template.bindingDelegate =

pkg/mdv/lib/src/template.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of mdv;
 
 /** Extensions to [Element]s that behave as templates. */
 class _TemplateExtension extends _ElementExtension {
   var _model;
+  BindingDelegate _bindingDelegate;
   _TemplateIterator _templateIterator;
+  bool _scheduled = false;
 
   _TemplateExtension(Element node) : super(node);
 
   void bind(String name, model, String path) {
     switch (name) {
       case 'bind':
       case 'repeat':
       case 'if':
         if (_templateIterator == null) {
           _templateIterator = new _TemplateIterator(node);
@@ skipping 22 matching lines @@
   void unbindAll() {
     unbind('bind');
     unbind('repeat');
     unbind('if');
     super.unbindAll();
   }
 
   /**
    * Creates an instance of the template.
    */
-  DocumentFragment createInstance(model, String syntax) {
+  DocumentFragment createInstance(model, BindingDelegate delegate) {
     var template = node.ref;
     if (template == null) template = node;
 
     var instance = _createDeepCloneAndDecorateTemplates(
-        template.content, syntax);
+        template.content, delegate);
 
     if (_instanceCreated != null) _instanceCreated.add(instance);
 
-    _addBindings(instance, model, TemplateElement.syntax[syntax]);
+    _addBindings(instance, model, delegate);
     _addTemplateInstanceRecord(instance, model);
     return instance;
   }
 
   /**
    * The data model which is inherited through the tree.
    */
   get model => _model;
 
   void set model(value) {
-    var syntax = TemplateElement.syntax[node.attributes['syntax']];
     _model = value;
-    _addBindings(node, model, syntax);
+    _ensureSetModelScheduled();
+  }
+
+  /**
+   * The binding delegate which is inherited through the tree. It can be used
+   * to configure custom syntax for `{{bindings}}` inside this template.
+   */
+  BindingDelegate get bindingDelegate => _bindingDelegate;
+
+  void set bindingDelegate(BindingDelegate value) {
+    _bindingDelegate = value;
+    _ensureSetModelScheduled();
+  }
+
+  _ensureSetModelScheduled() {
+    if (_scheduled) return;
+    _scheduled = true;
+    runAsync(_setModel);
+  }
+
+  void _setModel() {
+    _scheduled = false;
+    _addBindings(node, _model, _bindingDelegate);
   }
 }