using svn:externals with svn propset
if you can't use svn propedit (ie. your using bespin) you can use svn propset
svn propset svn:externals 'Zend http://framework.zend.com/svn/framework/standard/tags/release-1.10.0/library/Zend/' library
the above make the folder 'Zend' within the folder 'library' reference the zend svn repo
note: refer this post for info on svn:extermals with svn propedit http://blog.justin.kelly.org.au/svnexternals
