Issue 90 in svnbook: externals feature in svn 1.6.12 appears to support parent directory indicators

[svnbook at googlecode.com]

Comment #1 on issue 90 by bl... at orcaware.com: externals feature in svn  
1.6.12 appears to support parent directory indicators
http://code.google.com/p/svnbook/issues/detail?id=90

According to the "svn help ps":

       The ambiguous format 'relative_path relative_path' is taken as
       'relative_url relative_path' with peg revision support.

this implies that you're using a relative URL, not a relative path,
which is fine.

If you try an external of

     nant-tasks ../../../nant-tasks

then this should fail.  Can you try that?