In the late 1990s and early 2000s , he helped develop the WebDAV HTTP versioning specification , and is the main author of mod_dav , the first open - source implementation of WebDAV .
Stein has been especially active in version control systems development .
In the late 1990s and early 2000s , Stein helped develop the WebDAV HTTP versioning specification , and is the main author of mod_dav , the first open - source implementation of WebDAV .
Stein has been especially active in version control systems development .