--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/pyams_content/shared/resource/schema.py	Fri Jan 18 15:31:28 2019 +0100
@@ -0,0 +1,55 @@
+#
+# Copyright (c) 2008-2019 Thierry Florac <tflorac AT ulthar.net>
+# All Rights Reserved.
+#
+# This software is subject to the provisions of the Zope Public License,
+# Version 2.1 (ZPL).  A copy of the ZPL should accompany this distribution.
+# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
+# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
+# FOR A PARTICULAR PURPOSE.
+#
+
+__docformat__ = 'restructuredtext'
+
+from zope.interface import Interface, implementer
+from zope.schema import Int, Object
+from zope.schema.fieldproperty import FieldProperty
+from zope.schema.interfaces import IObject
+
+from pyams_content import _
+
+
+class IAgeRange(Interface):
+    """Age range attribute interface"""
+
+    min_value = Int(title=_("Minimum age"),
+                    required=False)
+
+    max_value = Int(title=_("Maximum age"),
+                    required=False)
+
+    def __bool__(self):
+        return self.min_value or self.max_value
+
+
+@implementer(IAgeRange)
+class AgeRange(object):
+    """Age range attribute object"""
+
+    min_value = FieldProperty(IAgeRange['min_value'])
+    max_value = FieldProperty(IAgeRange['max_value'])
+
+
+class IAgeRangeField(IObject):
+    """Age range schema field interface"""
+
+
+@implementer(IAgeRangeField)
+class AgeRangeField(Object):
+    """Age range schema field class"""
+
+    def __init__(self, **kwargs):
+        if 'schema' in kwargs:
+            del kwargs['schema']
+        super(AgeRangeField, self).__init__(IAgeRange, **kwargs)