Você precisa ler o SVN Book, pelo menos "Conceitos Fundamentais " e " Uso básico "
Resumindo: o capítulo "Layout recomendado do repositório" nos informa
...flexibility also means that it's easy to find yourself “lost without a roadmap” as you attempt to navigate different Subversion repositories which may carry completely different and unpredictable arrangements of the data within them.
To counteract this confusion, we recommend that you follow a repository layout convention (established long ago, in the nascency of the Subversion project itself) in which a handful of strategically named Subversion repository directories convey valuable meaning about the data they hold. Most projects have a recognizable “main line”, or trunk, of development; some branches, which are divergent copies of development lines; and some tags, which are named, stable snapshots of a particular line of development.