Subversion是一个版本控制系统，相对于的RCS、CVS，采用了分支管理系统，它的设计目标就是取代CVS。互联网上免费的版本控制服务多基于Subversion。
apache subversion v1.7.5 changelog:
User-visible changes:
- Client- and server-side bugfixes:
* http: report deleted-revision upon delete during update (r1327474)
- Client-side bugfixes:
* avoid potential segfault when canonicalizing properties (r1296369)
* improve memory and file-handle management with externals (issue #4130)
* serf: convert assertions to "MERGE failed" errors (r1302417)
* fix undefined behaviour during multi-segment reverse merges (issue #4144)
* fix potential use of already freed memory during diff operation (r1311935)
* improve performance of scan for the working copy root (r1306334)
* cmdline: fix segfault during 'svn diff' argument processing (r1311702)
* fix regression from 1.6 in update with --depth option (issue #4136)
* propset: avoid undefined behaviour in error path (r1325361)
* reset sqlite statements, partly for sqlite-3.7.11 compat (r1328846, et al)
* fix assertion during 'svn diff -r BASE:HEAD ^/trunk' (issue #4161)
* notify upon 'update' just removing locks on files (r1329876)
* neon: fix potential use of freed memory during commits (r1329388)
* 'status --xml' doesn't show repository deletes correctly (issue #4167)
* fix assert on svn:externals with drive letter on Windows (issue #4073)
* fix 'svn update --depth=empty' against 1.4 servers (issue #4046)
* handle missing svn:date reported by svnserve gracefully (r1306111)
* fix merges which first add a subtree and then delete it (issue #4166)
* fix a regression with checkout of file externals (issue #4087)
* don't add spurious mergeinfo to subtrees in edge-case merge (issue #4169)
* improve performance of status on large working copies (issue #4178)
- Server-side bugfixes:
* fix non-fatal FSFS corruption bug with concurrent commits (issue #4129)
* mod_dav_svn: raise an error on MERGE of non-existent resource (r1298343)
* mod_dav_svn: support compiling/running under httpd-2.4 (r1232267)
* mod_dav_svn: forbid BDB repositories under httpd's event MPM (issue #4157)
- Other tool improvements and bugfixes:
* emacs support: updates to dsvn.el and vc-svn.el (r1200896, et al)
Developer-visible changes:
- General:
* windows example distribution scripts: include svnrdump (r1295007)
* fix running the test suite with jsvn (r1335555)
- Bindings:
* swig-py tests: avoid FAILs on APR hash order (r1296137, r1292248)
* swig-rb tests: avoid FAILs on APR hash order (r1310535, r1310594)
* swig-pl: Improved perl detection in gen-make.py (r1291797, r1291810)