File created by Subversion, an open source version control system; stores a base copy of a file that is checked out from the Subversion repository; used to compare the working copy of a project file against its latest checked out version.
Subversion creates SVN-BASE files locally on the developer's computer when files are checked out from the repository. This allows Subversion to compare changes to files locally without having to re-fetch them from the remote repository. In this manner, SVN-BASE files are like a cache.
SVN-BASE files are stored within a .SVN hidden directory of a Subversion project. They typically are hidden by default within IDEs that integrate with Subversion.