diff --git a/openerp/addons/base/ir/ir_ui_view.py b/openerp/addons/base/ir/ir_ui_view.py
index 4d7b0f45d06..ac3644a28f7 100644
--- a/openerp/addons/base/ir/ir_ui_view.py
+++ b/openerp/addons/base/ir/ir_ui_view.py
@@ -94,21 +94,26 @@ class view(osv.osv):
            its inherited views, by rendering it using ``fields_view_get()``.
            
            @param browse_record view: view to validate
-           @return: True if the view hierarchy was rendered without any error, False if an error occurred.  
+           @return: the rendered definition (arch) of the view, always utf-8 bytestring (legacy convention)
+               if no error occurred, else False.  
         """
         try:
-            self.pool.get(view.model).fields_view_get(cr, uid, view_id=view.id, view_type=view.type, context=context)
-            return True
+            fvg = self.pool.get(view.model).fields_view_get(cr, uid, view_id=view.id, view_type=view.type, context=context)
+            return fvg['arch']
         except:
             _logger.exception("Can't render view %s for model: %s", view.xml_id, view.model)
             return False
 
     def _check_xml(self, cr, uid, ids, context=None):
         for view in self.browse(cr, uid, ids, context):
+            # Sanity check: the view should not break anything upon rendering!
+            view_arch_utf8 = self._check_render_view(cr, uid, view, context=context)
+            # always utf-8 bytestring - legacy convention
+            if not view_arch_utf8: return False
+
             # RNG-based validation is not possible anymore with 7.0 forms
-            # TODO 7.0: provide alternative assertion-based validation!
-            # TODO 7.0: and do the tests on the result of fields_view_get instead of each arch.
-            view_docs = [etree.fromstring(view.arch.encode('utf8'))]
+            # TODO 7.0: provide alternative assertion-based validation of view_arch_utf8
+            view_docs = [etree.fromstring(view_arch_utf8)]
             if view_docs[0].tag == 'data':
                 # A <data> element is a wrapper for multiple root nodes
                 view_docs = view_docs[0]
@@ -118,10 +123,6 @@ class view(osv.osv):
                     for error in validator.error_log:
                         _logger.error(tools.ustr(error))
                     return False
-
-            # Second sanity check: the view should not break anything upon rendering!
-            if not self._check_render_view(cr, uid, view, context=context):
-                return False
         return True
 
     _constraints = [
diff --git a/openerp/addons/base/rng/view.rng b/openerp/addons/base/rng/view.rng
index 54d08edc596..22d6ee12a88 100644
--- a/openerp/addons/base/rng/view.rng
+++ b/openerp/addons/base/rng/view.rng
@@ -39,6 +39,19 @@
         </rng:optional>
     </rng:define>
 
+    <rng:define name="modifiable">
+        <rng:optional>
+            <!-- @modifiers contains a JSON map unifying the various
+                 modifier attributes: @readonly, @required, @invisible.
+                 Each attribute is a key, mapped to a JSON list representing
+                 a condition expressed as an OpenERP `domain` filter
+                 Only some of the modifier keys make sense on some
+                 elements, for example <filter> and <group> only support
+                 `invisible`. -->
+            <rng:attribute name="modifiers"/>
+        </rng:optional>
+    </rng:define>
+
     <rng:define name="access_rights">
         <rng:optional>
             <rng:attribute name="groups"/>
@@ -294,6 +307,8 @@
         <rng:element name="label">
             <rng:ref name="overload"/>
             <rng:ref name="access_rights"/>
+            <rng:ref name="modifiable"/>
+            <rng:optional><rng:attribute name="invisible"/></rng:optional>
             <rng:optional><rng:attribute name="align"/></rng:optional>
             <rng:optional><rng:attribute name="nolabel"/></rng:optional>
             <rng:optional><rng:attribute name="colspan"/></rng:optional>
@@ -393,6 +408,7 @@
         <rng:element name="page">
             <rng:ref name="overload"/>
             <rng:ref name="access_rights"/>
+            <rng:ref name="modifiable"/>
             <rng:optional><rng:attribute name="string"/></rng:optional>
             <rng:optional><rng:attribute name="name"/></rng:optional>
             <rng:optional><rng:attribute name="attrs"/></rng:optional>
@@ -443,6 +459,8 @@
         <rng:element name="separator">
             <rng:ref name="overload"/>
             <rng:ref name="access_rights"/>
+            <rng:ref name="modifiable"/>
+            <rng:optional><rng:attribute name="invisible"/></rng:optional>
             <rng:optional><rng:attribute name="name"/></rng:optional>
             <rng:optional><rng:attribute name="colspan"/></rng:optional>
             <rng:optional><rng:attribute name="rowspan"/></rng:optional>
@@ -508,6 +526,7 @@
             <rng:attribute name="name" />
             <rng:ref name="overload"/>
             <rng:ref name="access_rights"/>
+            <rng:ref name="modifiable"/>
             <rng:optional><rng:attribute name="domain_filter"/></rng:optional>
             <rng:optional><rng:attribute name="attrs"/></rng:optional>
             <rng:optional><rng:attribute name="string"/></rng:optional>
@@ -587,6 +606,7 @@
         <rng:element name="group">
             <rng:ref name="overload"/>
             <rng:ref name="access_rights"/>
+            <rng:ref name="modifiable"/>
             <rng:optional><rng:attribute name="attrs"/></rng:optional>
             <rng:optional><rng:attribute name="colspan"/></rng:optional>
             <rng:optional><rng:attribute name="rowspan"/></rng:optional>
@@ -598,6 +618,7 @@
             <rng:optional><rng:attribute name="width"/></rng:optional>
             <rng:optional><rng:attribute name="name"/></rng:optional>
             <rng:optional><rng:attribute name="color" /></rng:optional>
+            <rng:optional><rng:attribute name="invisible"/></rng:optional>
             <rng:ref name="container"/>
         </rng:element>
     </rng:define>
@@ -640,6 +661,7 @@
         <rng:element name="button">
             <rng:ref name="overload"/>
             <rng:ref name="access_rights"/>
+            <rng:ref name="modifiable"/>
             <rng:optional><rng:attribute name="attrs"/></rng:optional>
             <rng:optional><rng:attribute name="invisible"/></rng:optional>
             <rng:optional><rng:attribute name="name" /></rng:optional>
@@ -684,7 +706,9 @@
         <rng:element name="filter">
             <rng:ref name="overload"/>
             <rng:ref name="access_rights"/>
+            <rng:ref name="modifiable"/>
             <rng:optional><rng:attribute name="attrs"/></rng:optional>
+            <rng:optional><rng:attribute name="invisible"/></rng:optional>
             <rng:optional><rng:attribute name="name" /></rng:optional>
             <rng:optional><rng:attribute name="separator" /></rng:optional>
             <rng:optional><rng:attribute name="icon" /></rng:optional>