diff --git a/composer/schema/README.txt b/composer/schema/README.txt
index bf0a073..840469a 100644
--- a/composer/schema/README.txt
+++ b/composer/schema/README.txt
@@ -51,8 +51,8 @@ Field types
 
   >>> from cybertools.composer.schema.interfaces import fieldTypes
   >>> sorted(t.token for t in fieldTypes)
-  ['checkbox', 'checkboxes', 'date', 'display', 'dropdown', 'email',
-   'fileupload', 'html', 'list', 'number', 'password', 'radiobuttons',
+  ['checkbox', 'checkboxes', 'date', 'display', 'dropdown', 'email', 'explanation',
+   'fileupload', 'heading', 'html', 'list', 'number', 'password', 'radiobuttons',
    'spacer', 'textarea', 'textline']
 
   >>> from zope.schema.vocabulary import SimpleVocabulary
diff --git a/composer/schema/browser/schema.py b/composer/schema/browser/schema.py
index f0afd7a..78121e2 100644
--- a/composer/schema/browser/schema.py
+++ b/composer/schema/browser/schema.py
@@ -25,8 +25,11 @@ $Id$
 from zope import component
 from zope.cachedescriptors.property import Lazy
 
-from cybertools.composer.schema.browser.common import BaseView
 from cybertools.composer.interfaces import IInstance
+from cybertools.composer.rule.base import Event
+from cybertools.composer.rule.interfaces import IRuleManager
+from cybertools.composer.schema.browser.common import BaseView
+from cybertools.composer.schema.client import eventTypes, getCheckoutRule
 from cybertools.composer.schema.interfaces import IClientFactory
 from cybertools.composer.schema.schema import FormState
 
@@ -101,3 +104,60 @@ class SchemaView(BaseView):
         self.request.response.redirect(self.getNextUrl())
         return False
 
+
+class FormManagerView(BaseView):
+
+    isManageMode = False
+
+    def getCustomView(self):
+        if self.isManageMode:
+            return None
+        viewName = self.context.getViewName()
+        if viewName:
+            return component.getMultiAdapter((self.context, self.request),
+                                             name=viewName)
+        return None
+
+    @Lazy
+    def manager(self):
+        return self.context
+
+    def overview(self):
+        return []
+
+
+class CheckoutView(BaseView):
+
+    def getClient(self):
+        clientName = self.getClientName()
+        if clientName is None:
+            return None
+        return self.context.getClients().get(clientName)
+
+    def getClientData(self):
+        client = self.getClient()
+        if client is None:
+            return {}
+        instance = IInstance(client)
+        data = instance.applyTemplate()
+        return data
+
+    def update(self):
+        data = self.getClientData()
+        if data.get('errors'):
+            return True
+        form = self.request.form
+        clientName = self.getClientName()
+        if not form.get('action'):
+            return True     # TODO: error, redirect to overview
+        client = self.getClient()
+        if client is None:
+            return True     # TODO: error, redirect to overview
+        # send mail
+        rm = IRuleManager(self.context)
+        rm.addRule(getCheckoutRule(self.context.senderEmail))
+        result = rm.handleEvent(Event(eventTypes['client.checkout'],
+                                      client, self.request))
+        #params = '?message=thankyou&id=' + self.clientName
+        #self.request.response.redirect(self.url + '/checkout.html' + params)
+        return False
diff --git a/composer/schema/client.py b/composer/schema/client.py
index 458899b..8c7dd4a 100644
--- a/composer/schema/client.py
+++ b/composer/schema/client.py
@@ -29,6 +29,8 @@ from zope.component import adapts
 from zope.interface import implements
 
 from cybertools.composer.message.base import MessageManager
+from cybertools.composer.rule.base import RuleManager, EventType
+from cybertools.composer.rule.base import Rule, Action
 from cybertools.composer.schema.interfaces import IClient
 from cybertools.composer.schema.interfaces import IClientManager, IClientFactory
 from cybertools.util.jeep import Jeep
@@ -113,3 +115,31 @@ class MessageManagerAdapter(MessageManager):
     def messages(self):
         return self.context.messages
 
+
+class RuleManagerAdapter(RuleManager):
+
+    adapts(IClientManager)
+
+    def __init__(self, context):
+        self.context = context
+
+
+eventTypes = Jeep((
+    EventType('client.checkout'),
+))
+
+
+def getCheckoutRule(sender):
+    """ A rule for sending a confirmation message, provided by default.
+    """
+    checkoutRule = Rule('checkout')
+    checkoutRule.events.append(eventTypes['client.checkout'])
+    checkoutRule.actions.append(Action('sendmail',
+                      parameters=dict(sender=sender,
+                                      messageName='feedback_text')))
+    checkoutRule.actions.append(Action('redirect',
+                      parameters=dict(viewName='message_view.html',
+                                      messageName='feedback_html',
+                                      clearClient=True)))
+    return checkoutRule
+
diff --git a/composer/schema/interfaces.py b/composer/schema/interfaces.py
index 1670688..bf6dbc4 100644
--- a/composer/schema/interfaces.py
+++ b/composer/schema/interfaces.py
@@ -106,8 +106,12 @@ fieldTypes = SimpleVocabulary((
               instanceName='checkboxes'),
     FieldType('calculated', 'display', u'Calculated Value',
               instanceName='calculated'),
+    FieldType('heading', 'heading', u'Fieldgroup Heading',
+              fieldRenderer='field_heading', storeData=False),
     FieldType('spacer', 'spacer', u'Spacer',
               fieldRenderer='field_spacer', storeData=False),
+    FieldType('explanation', 'explanation', u'Explanation',
+              fieldRenderer='field_explanation', storeData=False),
 ))
 
 # TODO: move this to organize.service... (???)
@@ -121,6 +125,12 @@ standardFieldNames = SimpleVocabulary((
     # TODO: on organize.service: extend this list, e.g. with 'totalCost'
 ))
 
+defaultValueTypes = SimpleVocabulary((
+    SimpleTerm('string', 'string', 'String'),
+    SimpleTerm('tales', 'tales', 'TAL expression'),
+))
+
+
 class IField(IComponent):
     """ May be used for data entry or display.
     """
@@ -155,6 +165,13 @@ class IField(IComponent):
                 description=_(u'Value with which to pre-set the field contents. '
                         'Use this also for populating a calculated field.'),
                 required=False,)
+    defaultValueType = schema.Choice(
+                title=_(u'Default type'),
+                description=_(u'The type of the default, i.e. a fixed string '
+                        u'or an expression that is used to calculate the value.'),
+                required=False,
+                default='string',
+                vocabulary=defaultValueTypes)
     required = schema.Bool(
                 title=_(u'Required'),
                 description=_(u'Must a value be entered into this field?'),