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svn:externals can be great for sucking in central libraries or IP into a project, so that they can be kept in one location accessible for all.
But if I'm asking people to external tags of common IP (so it doesn't change on them) it opens the possibility of them inadvertently committing changes to the tag.
How can I make svn:externals read-only? It's acceptable if there is some extra argument or some way of making the external that we can add to the procedure for everyone to follow.