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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