freezing revision of externals

Hi,

I have the situation, that I have the source for a server program in one directory and the libraries as externals in a subdirectory of that one. The libraries are maintained by a couple of people and are frequently changed. The problem I face is that the different revisions of the libraries may not work together, if I update one of the libraries. Additionally, it is hard to recreate the exact combination of server and library code for a given server version that way.
What I would like to have is to make a tag with svn copy of the server code AND to store the externals with the currently used revision within the tag copy and only for the tag copy - not changed in my current working copy or in the trunk.

So for example, if I want to make a tag server-1-2, I would like to have the externals stored as say lib1-r1000, lib2-r99, lib3-101 etc. - if they are not pointing to a tag already - in what you normally edit with svn propedit svn:externals.

Is there a way to already achieve this or to generate a list of fixed externals quickly?

Thanks in advance for information.

Best regards,

Christoph

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