svn - Relative Path in Subversion external configuration

Question

Is there any way to use Relative path when configuring subversion externals.

For example

 Trunk
      - directoryA
      - directoryB
      - projectA {external DirectoryB}

For configuring ProjectA we have to configure full path in the external property which is causing problems or forcing us to do change the properties when we do branches.

Any way to automate the branching process or fix with absolute path will be useful

Answer 1

Subversion 1.5 clients support relative urls:

See the Subversion 1.5 release notes and the subversion manual for more details

Some examples: (Note that the comment syntax is not supported)

# Repository root relative
^/projectX/trunk/src/ projectX

# Relative to current directory
../../dependency/X X

# Server root relative
/svn/repos/projectX/trunk/src projectX

# Schema relative
//svn.collab.net/repos/svn/trunk svn