Subversion layers

"Let's write a version control system with apr, bdb, xml, dav, vdelta! PROFIT!"

• fs - fliesystem layer, has bdb and fsfs backends
• repos - repository representation layer, provide hooks and easy modification to fs
• ra - networked repository access layer, file://, svn://, and http:// backends
• wc - working copy management
• TERRIBLE SPAGHETTI CODE
• client - using wc and ra, resembles a client with pluggable notification functions

But more importantly there's a delta library, which abstract the deltas between trees. They are called "editor editors"