Is it possible to rename svn tag

Is it possible to rename a tag in subversion?

Whenever I release a production version of the application, I tag the revision with the corresponding number, e.g, when version 1.0.0 was released, a corresponding tag was created:

svn copy https://svn.mydomain.com/project/trunk https://svn.mydomain.com/project/tags/v_1.0.0

In this same manner, I just checked in the code for version 1.0.3 of the application and create the corresponding tag. However I noticed that when 1.0.2 was released, the tag was created as v_1.2 instead of v_1.0.2. Is there a way to rename the tag? At present, I have this:

r14 - final changes for version 1.0.2
r15 - tag 1.2 created
r16 - more changes
r17 - more changes
r18 - final changes for 1.0.3
r19 - tag 1.0.3 created

I'd like to rename tag 1.2 to 1.0.2. Is there a way to do this?