For the following example (taken from "Zope3 In 30 Minutes"):
class IMark(Interface):
"""This is the book mark object."""
url = TextLine(
title=u"URL/Link",
description=u"URL of the website",
default=u"http://www.zope.org";,
required=True)
description = Text(
title=u"Description",
description=u"Description of the website",
default=u"",
required=False)
How can I prevent Mark objects from having the same url? So if a Mark
object exists in BookMarker with Mark.url="http://www.zope.org/";, how
can I prevent another Mark object from being added when its url is
"http://www.zope.org";?
Thanks.
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