Subversion allows users to invent arbitrarily-named
versioned properties on files and directories, as well as
unversioned properties on revisions. The only restriction is on
properties whose names begin with svn:
(those
are reserved for Subversion's own use). While these properties
may be set by users to control Subversion's behavior, users may
not invent new svn:
properties.
svn:executable
If present on a file, the client will make the file executable in Unix-hosted working copies. See the section called “File Executability”.
svn:mime-type
If present on a file, the value indicates the file's mime-type. This allows the client to decide whether line-based contextual merging is safe to perform during updates, and can also affect how the file behaves when fetched via web browser. See the section called “File Content Type”.
svn:ignore
If present on a directory, the value is a list of unversioned file patterns to be ignored by svn status and other subcommands. See the section called “Ignoring Unversioned Items”
svn:keywords
If present on a file, the value tells the client how to expand particular keywords within the file. See the section called “Keyword Substitution”.
svn:eol-style
If present on a file, the value tells the client how to manipulate the file's line-endings in the working copy, and in exported trees. See the section called “End-of-Line Character Sequences” and svn export.
svn:externals
If present on a directory, the value is a multi-line list of other paths and URLs the client should check out. See the section called “Externals Definitions”.
svn:special
If present on a file, indicates that the file is not an ordinary file, but a symbolic link or other special object[60].
svn:needs-lock
If present on a file, tells the client to make the file read-only in the working copy, as a reminder that the file should be locked before editing begins. See the section called “Lock Communication”.
svn:author
If present, contains the authenticated username of the person who created the revision. (If not present, then the revision was committed anonymously.)
svn:date
Contains the UTC time the revision was created, in ISO 8601 format. The value comes from the server machine's clock, not the client's.
svn:log
Contains the log message describing the revision.
svn:autoversioned
If present, the revision was created via the autoversioning feature. See the section called “Autoversioning”.
[60] As of this writing, symbolic links are indeed the only “special” objects. But there might be more in future releases of Subversion.