svn:externals - construction of cyclic references is not prevented by SVN

[Meinc <me...@web.de>]

Hi,

today we have edited our svn repository and accidentally added a self-reference, i.e. a reference established by means of svn:externals.
It would be helpful, if self references would be rejected by SVN at the time of creation, since the retrieval of such cyclic repositories may cause some serious problems.
We had some luck, the only problem was to get rid of file paths with more that 255 characters which required some extra effort.
Although this problem could be handled by SVN clients (Tortoise SVN does not), it would be worth to reject on commits.

Regards
Bob 
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