Is there any way to list all defined revision properties

I did some research, and found a thread that offers no hope:
http://svn.haxx.se/users/archive-2006-06/1242.shtml
 
However, it's been a couple of years and I would like to put the
question to you all again. Is there any way to list all defined
revision properties as of a particular revision, for a particular path?
For example, I have a project that has several svn:externals properties
defined, and the way things work here I expect there will be a
proliferation of these properties at multiple levels of many projects.
So, in the interest of saving time and effort in keeping track of them,
I would like to be able to do something like this:
 
listprops -r255 svn://myrepository/my/path <property names | file
containing property names>
 
and get a list of all nodes that have those properties, and their
values.
 
I expect the answer will be "can't help you", but it is worth a try. If
no such utility currently exists, what would it take to build one?

--
David
*************************************************************************
This communication, including attachments, is
for the exclusive use of addressee and may contain proprietary,
confidential and/or privileged information.  If you are not the intended
recipient, any use, copying, disclosure, dissemination or distribution is
strictly prohibited.  If you are not the intended recipient, please notify
the sender immediately by return e-mail, delete this communication and
destroy all copies.
*************************************************************************
---------------------------------------------------------------------
To unsubscribe, e-mail: users-unsubscribe_at_subversion.tigris.org
For additional commands, e-mail: users-help_at_subversion.tigris.org