How to know from which revision a tag is copied?

For example, after I issue "svn cp http://localhost/svn/project/trunk
http://localhost/svn/project/tags/release-1.0" and after some while,
how can I tell from which revision that tag branch is created? I can
check the output of "svn log" but is there a single command?

--
regards,
Gary Shi
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