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If the trunk versions move on, and you later want beta1 to include one of the updated files, then update what "beta1" refers to by relinking from the beta1 directory to the version you really want:

• Wiki Markup
  removing the file (link) you no longer need from the "tag" dir eg svn rm https://....../tags/..../foo.txt \[1\]

• Wiki Markup
  copying back in (ie link to) the version you want eg svn cp -r 100 https://..../trunk/.../foo.txt \[2\] https://..../tags/.../foo.txt \[3\] \\

\[1\] or if you have a working copy of the tag dir, you can 
    do svn rm and svn commit
\[2\] if you want the latest version, just omit the -r 100.
\[3\] or if you have a working copy of the tag, copy to your working
    copy then svn commit it.

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• Windows: C:\Documents and Settings\yourname\Application Data\Subversion\config
• Linux: ~/.subversion/config
  

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See: http://www.apache.org/dev/svn-eol-style.txt for the canonical list of auto-props settings.