can I use svn:externals instead of svn copy to create a tag?

All examples I have seen for tagging use svn copy (or svncopy -tag) to
create a tag. If I want to make sure nobody can change the tag, I guess
I could write a commit hook. But couldn't I use a versioned external
definition to create the tag instead of svn copy? Seems this would
better enforce that nobody can change the tag, since it isn't a copy at
all. One downside would be that if the tag contains unversioned
externals, I would not be able to pin them down, but I don't plan to
have unversioned externals. Are there any other downsides?

Example:
trunk/
tags/
    X -r123 ^trunk version_1.0

Cheers,
  Gary
Received on 2010-06-10 22:45:13 CEST