diff --git a/browser/action.py b/browser/action.py
index 4330f6e..20420d2 100644
--- a/browser/action.py
+++ b/browser/action.py
@@ -39,7 +39,7 @@ class TargetAction(Action):
     viewTitle = ''
     addParams = {}
 
-    #@Lazy
+    @Lazy
     def url(self):
         if self.page is None:   # how could this happen?
             baseUrl = self.view.virtualTargetUrl
diff --git a/browser/form.py b/browser/form.py
index d68e74f..0e10db8 100644
--- a/browser/form.py
+++ b/browser/form.py
@@ -57,6 +57,7 @@ from loops.browser.concept import ConceptRelationView
 from loops.i18n.browser import I18NView
 from loops.query import ConceptQuery, IQueryConcept
 from loops.resource import Resource
+from loops.schema.field import relation_macros
 from loops.type import ITypeConcept
 from loops import util
 from loops.util import _
@@ -113,6 +114,7 @@ class ObjectForm(NodeView):
         # replace HTML edit widget with Dojo Editor
         renderers['input_html'] = self.template.macros['input_html']
         renderers['input_grid'] = grid_macros.macros['input_grid']
+        renderers['input_relationset'] = relation_macros.macros['input_relationset']
         return renderers
 
     @Lazy
@@ -358,6 +360,7 @@ class CreateConceptForm(CreateObjectForm):
         if ti is None:
             return c
         ad = ti(c)
+        ad.__is_dummy__ = True
         return ad
 
     @Lazy
@@ -394,7 +397,8 @@ class CreateConceptPage(CreateConceptForm):
 
     @Lazy
     def nextUrl(self):
-        return self.nodeView.getUrlForTarget(self.context)
+        #return self.nodeView.getUrlForTarget(self.context)
+        return self.getUrlForTarget(self.context)
 
 
 class InnerForm(CreateObjectForm):
diff --git a/browser/loops.js b/browser/loops.js
index 1345f4c..8b0b7f2 100644
--- a/browser/loops.js
+++ b/browser/loops.js
@@ -143,6 +143,17 @@ function addConceptAssignment(prefix, suffix) {
     node.appendChild(tr);
 }
 
+function addRelation(fieldName) {
+    valuesNode = dojo.byId(fieldName + '_values');
+    widget = dijit.byId(fieldName + '_search');
+    token = widget.getValue();
+    title = widget.getDisplayedValue();
+    ih = '<input type="checkbox" name="' + name + ':list" value="' + token + '" checked> <span>' + title + '</span>';
+    newNode = document.createElement('div');
+    newNode.innerHTML = ih;
+    valuesNode.appendChild(newNode);
+}
+
 function validate() {
     //var form = dijit.byId('dialog_form');
     var form = dojo.byId('dialog_form');
diff --git a/common.py b/common.py
index 79ac503..5724308 100644
--- a/common.py
+++ b/common.py
@@ -96,6 +96,8 @@ class AdapterBase(object):
     _noexportAttributes = ()
     _textIndexAttributes = ()
 
+    __is_dummy__ = False
+
     languageInfo = None
 
     def __init__(self, context):
@@ -107,7 +109,7 @@ class AdapterBase(object):
         return getattr(self.context, '_' + attr, None)
 
     def __setattr__(self, attr, value):
-        if attr in self._adapterAttributes:
+        if attr.startswith('__') or attr in self._adapterAttributes:
             try:
                 object.__setattr__(self, attr, value)
             except AttributeError:
@@ -332,6 +334,8 @@ class ParentRelationSet(RelationSet):
         self.context.deassignParent(related, [self.predicate])
 
     def __iter__(self):
+        if self.adapted.__is_dummy__:
+            return
         for c in self.context.getParents([self.predicate]):
             yield adapted(c, langInfo=self.langInfo)
 
@@ -350,6 +354,8 @@ class ChildRelationSet(RelationSet):
         self.context.deassignChild(related, [self.predicate])
 
     def __iter__(self):
+        if self.adapted.__is_dummy__:
+            return
         for c in self.context.getChildren([self.predicate]):
             yield adapted(c, langInfo=self.langInfo)
 
diff --git a/configure.zcml b/configure.zcml
index c05be78..fb088c1 100644
--- a/configure.zcml
+++ b/configure.zcml
@@ -346,13 +346,15 @@
            name="fileupload" />
   <adapter factory="cybertools.composer.schema.grid.field.GridFieldInstance"
            name="grid" />
+  <adapter factory="loops.schema.field.RelationSetFieldInstance"
+           name="relationset" />
 
   <adapter factory="cybertools.composer.schema.factory.SchemaFactory" />
-  <adapter factory="loops.schema.ResourceSchemaFactory" />
-  <adapter factory="loops.schema.ResourceSchemaFactory"
+  <adapter factory="loops.schema.factory.ResourceSchemaFactory" />
+  <adapter factory="loops.schema.factory.ResourceSchemaFactory"
            for="loops.interfaces.IResource" />
-  <adapter factory="loops.schema.FileSchemaFactory" />
-  <adapter factory="loops.schema.NoteSchemaFactory" />
+  <adapter factory="loops.schema.factory.FileSchemaFactory" />
+  <adapter factory="loops.schema.factory.NoteSchemaFactory" />
 
   <adapter factory="loops.setup.SetupManager" />
 
diff --git a/schema/__init__.py b/schema/__init__.py
new file mode 100644
index 0000000..4bc90fb
--- /dev/null
+++ b/schema/__init__.py
@@ -0,0 +1,4 @@
+"""
+$Id$
+"""
+
diff --git a/schema/base.py b/schema/base.py
new file mode 100644
index 0000000..d4711f7
--- /dev/null
+++ b/schema/base.py
@@ -0,0 +1,76 @@
+#
+#  Copyright (c) 2009 Helmut Merz helmutm@cy55.de
+#
+#  This program is free software; you can redistribute it and/or modify
+#  it under the terms of the GNU General Public License as published by
+#  the Free Software Foundation; either version 2 of the License, or
+#  (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software
+#  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+#
+
+"""
+Specialized field definitions.
+
+$Id$
+"""
+
+from zope.component import adapts
+from zope.interface import Attribute, implements
+from zope.schema import Choice, List
+from zope.schema.interfaces import IChoice, IList
+
+from cybertools.composer.schema.interfaces import FieldType
+
+
+class IRelation(IChoice):
+    """ An object addressed via a single relation.
+    """
+
+    target_types = Attribute('A list of names that denote types of '
+                'loops objects (typically concept types) that may be used as '
+                'targets for the relation.')
+
+
+class IRelationSet(IList):
+    """ A collection of objects addressed via a set of relations.
+
+        Despite its name, the collection may have a predefined order.
+    """
+
+    target_types = Attribute('A list of names that denote types of '
+                'loops objects (typically concept types) that may be used as '
+                'targets for the relations.')
+
+
+class Relation(Choice):
+
+    implements(IRelation)
+
+    __typeInfo__ = ('relation',)
+
+    def __init__(self, *args, **kw):
+        self.target_types = kw.pop('target_types')
+        super(Relation, self).__init__(*args, **kw)
+
+
+class RelationSet(List):
+
+    implements(IRelationSet)
+
+    __typeInfo__ = ('relationset',
+                    FieldType('relationset', 'relationset',
+                              u'A field representing a sequence of related objects.',
+                              instanceName='relationset'))
+
+    def __init__(self, *args, **kw):
+        self.target_types = kw.pop('target_types')
+        super(RelationSet, self).__init__(*args, **kw)
+
diff --git a/schema.py b/schema/factory.py
similarity index 60%
rename from schema.py
rename to schema/factory.py
index 1d47974..33697af 100644
--- a/schema.py
+++ b/schema/factory.py
@@ -17,64 +17,16 @@
 #
 
 """
-Specialized fields and schema factories
+Specialized fields factories.
 
 $Id$
 """
 
 from zope.component import adapts
-from zope.interface import Attribute, implements
-from zope.schema import Choice, List
-from zope.schema.interfaces import IChoice, IList
 
 from cybertools.composer.schema.factory import SchemaFactory
 from loops.interfaces import IResourceAdapter, IFile, INote
 
-# fields
-
-class IRelation(IChoice):
-    """ An object addressed via a single relation.
-    """
-
-    target_types = Attribute('A list of names that denote types of '
-                'loops objects (typically concept types) that may be used as '
-                'targets for the relation.')
-
-
-class IRelationSet(IList):
-    """ A collection of objects addressed via a set of relations.
-
-        Despite its name, the collection may have a predefined order.
-    """
-
-    target_types = Attribute('A list of names that denote types of '
-                'loops objects (typically concept types) that may be used as '
-                'targets for the relations.')
-
-
-class Relation(Choice):
-
-    implements(IRelation)
-
-    __typeInfo = ('relation',)
-
-    def __init__(self, *args, **kw):
-        self.target_types = kw.pop('target_types')
-        super(Relation, self).__init__(*args, **kw)
-
-
-class RelationSet(List):
-
-    implements(IRelationSet)
-
-    __typeInfo = ('relationset',)
-
-    def __init__(self, *args, **kw):
-        self.target_types = kw.pop('target_types')
-        super(RelationSet, self).__init__(*args, **kw)
-
-
-# schema factories
 
 class ResourceSchemaFactory(SchemaFactory):
 
diff --git a/schema/field.py b/schema/field.py
new file mode 100644
index 0000000..f799bc9
--- /dev/null
+++ b/schema/field.py
@@ -0,0 +1,64 @@
+#
+#  Copyright (c) 2008 Helmut Merz helmutm@cy55.de
+#
+#  This program is free software; you can redistribute it and/or modify
+#  it under the terms of the GNU General Public License as published by
+#  the Free Software Foundation; either version 2 of the License, or
+#  (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software
+#  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+#
+
+"""
+Field and field instance classes for grids.
+
+$Id$
+"""
+
+from zope import component
+from zope.component import adapts
+from zope.interface import implements
+from zope.app.pagetemplate import ViewPageTemplateFile
+from zope.cachedescriptors.property import Lazy
+import zope.schema
+
+from cybertools.composer.schema.factory import createField
+from cybertools.composer.schema.field import ListFieldInstance
+from cybertools.composer.schema.interfaces import IField, IFieldInstance
+from cybertools.composer.schema.interfaces import fieldTypes, undefined
+from cybertools.util.format import toStr, toUnicode
+from cybertools.util import json
+from loops import util
+
+
+relation_macros = ViewPageTemplateFile('relation_macros.pt')
+
+
+class RelationSetFieldInstance(ListFieldInstance):
+
+    def marshall(self, value):
+        return [dict(title=v.title, uid=util.getUidForObject(v.context))
+                for v in value]
+
+    def display(self, value):
+        return value
+
+    def unmarshall(self, value):
+        return value
+
+    @Lazy
+    def typesParams(self):
+        result = []
+        types = self.context.target_types
+        for t in types:
+            result.append('searchType=loops:concept:%s' % t)
+        if result:
+            return '?' + '&'.join(result)
+        return ''
diff --git a/schema/relation_macros.pt b/schema/relation_macros.pt
new file mode 100755
index 0000000..f0d1dda
--- /dev/null
+++ b/schema/relation_macros.pt
@@ -0,0 +1,31 @@
+<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-US" lang="en-US"
+      i18n:domain="loops">
+<body>
+
+
+<metal:textline define-macro="input_relationset"
+                tal:define="fieldInstance field/getFieldInstance;
+                            types fieldInstance/typesParams">
+    <div dojoType="dojox.data.QueryReadStore" jsId="conceptSearch"
+         tal:attributes="url string:listConceptsForComboBox.js$types;
+                         jsId string:${name}_search_store" >
+    </div>
+    <div tal:attributes="id string:${name}_values">
+      <div tal:repeat="obj data/?name">
+        <input type="checkbox" checked
+               tal:attributes="name string:$name:list;
+                               value obj/uid" />
+        <span tal:content="obj/title" />
+      </div>
+    </div>
+    <input dojoType="dijit.form.FilteringSelect"
+           autoComplete="False" labelAttr="label"
+           tal:attributes="store string:${name}_search_store;
+                           name string:${name}_search;
+                           id string:${name}_search;
+                           onChange string:addRelation('$name')" />
+</metal:textline>
+
+
+</body>
+</html>
diff --git a/search/browser.py b/search/browser.py
index 3579625..43996c6 100644
--- a/search/browser.py
+++ b/search/browser.py
@@ -98,29 +98,32 @@ class Search(BaseView):
         title = request.get('name')
         if title == '*':
             title = None
-        type = request.get('searchType')
+        types = request.get('searchType')
         data = []
-        if title or type:
+        if title or types:
             if title is not None:
                 title = title.replace('(', ' ').replace(')', ' ').replace(' -', ' ')
                 #title = title.split(' ', 1)[0]
-            if not type:
-                type = 'loops:concept:*'
-            result = ConceptQuery(self).query(title=title or None, type=type,
-                                              exclude=('system',))
-            for o in result:
-                if o.getLoopsRoot() == self.loopsRoot:
-                    name = adapted(o, self.languageInfo).title
-                    if title and title.endswith('*'):
-                        title = title[:-1]
-                    sort = ((title and name.startswith(title) and '0' or '1')
-                            + name.lower())
-                    if o.conceptType is None:
-                        raise ValueError('Concept Type missing for %r.' % name)
-                    data.append({'label': '%s (%s)' % (name, o.conceptType.title),
-                                 'name': name,
-                                 'id': util.getUidForObject(o),
-                                 'sort': sort})
+            if not types:
+                types = ['loops:concept:*']
+            if not isinstance(types, (list, tuple)):
+                types = [types]
+            for type in types:
+                result = ConceptQuery(self).query(title=title or None, type=type,
+                                                  exclude=('system',))
+                for o in result:
+                    if o.getLoopsRoot() == self.loopsRoot:
+                        name = adapted(o, self.languageInfo).title
+                        if title and title.endswith('*'):
+                            title = title[:-1]
+                        sort = ((title and name.startswith(title) and '0' or '1')
+                                + name.lower())
+                        if o.conceptType is None:
+                            raise ValueError('Concept Type missing for %r.' % name)
+                        data.append({'label': '%s (%s)' % (name, o.conceptType.title),
+                                     'name': name,
+                                     'id': util.getUidForObject(o),
+                                     'sort': sort})
         data.sort(key=lambda x: x['sort'])
         if not title:
             data.insert(0, {'label': '', 'name': '', 'id': ''})
diff --git a/tests/setup.py b/tests/setup.py
index 7101e78..d830da4 100644
--- a/tests/setup.py
+++ b/tests/setup.py
@@ -61,7 +61,9 @@ from loops.expert.concept import QueryConcept
 from loops.resource import Resource, FileAdapter, TextDocumentAdapter
 from loops.resource import Document, MediaAsset
 from loops.resource import IndexAttributes as ResourceIndexAttributes
-from loops.schema import ResourceSchemaFactory, FileSchemaFactory, NoteSchemaFactory
+from loops.schema.factory import ResourceSchemaFactory, FileSchemaFactory, \
+                                 NoteSchemaFactory
+from loops.schema.field import RelationSetFieldInstance
 from loops.security.common import grantAcquiredSecurity, revokeAcquiredSecurity
 from zope.security.management import setSecurityPolicy
 from loops.security.policy import LoopsSecurityPolicy
@@ -141,6 +143,7 @@ class TestSite(object):
         component.provideAdapter(BooleanFieldInstance, name='boolean')
         component.provideAdapter(ListFieldInstance, name='list')
         component.provideAdapter(FileUploadFieldInstance, name='fileupload')
+        component.provideAdapter(RelationSetFieldInstance, name='relationset')
         component.provideAdapter(SchemaFactory)
         component.provideAdapter(ResourceSchemaFactory)
         component.provideAdapter(FileSchemaFactory)