<p>Things like <code>$log$</code> and <code>$version$</code> which add data upon check-in to the file. I'm interested in seeing the other ones and what information they can provide, but I can't get much info unless I know what they are called.</p>

[{'answer_id': 39786, 'author': 'David Webb', 'author_id': 3171, 'author_profile': 'https://Stackoverflow.com/users/3171', 'pm_score': 4, 'selected': True, 'text': '<p>Both Subversion and CVS call them <code>Keywords</code>.</p>\n\n<p><a href="http://svnbook.red-bean.com/en/1.0/ch07s02.html#svn-ch-7-sect-2.3" rel="nofollow noreferrer">Have a look in the SVN manual here</a> (scroll down to <strong>svn:keywords</strong>) or <a href="http://badgertronics.com/writings/cvs/keywords.html" rel="nofollow noreferrer">here for CVS</a>.</p>\n'}, {'answer_id': 39789, 'author': 'Will Robertson', 'author_id': 4161, 'author_profile': 'https://Stackoverflow.com/users/4161', 'pm_score': 1, 'selected': False, 'text': '<p>In SVN these are simply called "properties". You can read about them in the SVN book:</p>\n\n<p><a href="http://svnbook.red-bean.com/en/1.8/svn.advanced.props.html" rel="nofollow noreferrer">http://svnbook.red-bean.com/en/1.8/svn.advanced.props.html</a></p>\n\n<hr>\n\n<p>Err, so, are they called properties or keywords? Oh, I see. In SVN you can associate arbitrary metadata, called "properties", with versioned files; some of the properties you can set are to set up keyword substitution in the files themselves.</p>\n'}, {'answer_id': 76142, 'author': 'Nathan Strutz', 'author_id': 5918, 'author_profile': 'https://Stackoverflow.com/users/5918', 'pm_score': 0, 'selected': False, 'text': '<p>These are Keyword substitutions. The link to SVNBook 1.8 is here: <a href="http://svnbook.red-bean.com/en/1.8/svn.advanced.props.special.keywords.html" rel="nofollow noreferrer" title="Subversion Keywords">http://svnbook.red-bean.com/en/1.8/svn.advanced.props.special.keywords.html</a>.</p>\n\n<p>Subversion\'s built-in keywords are:</p>\n\n<ul>\n<li>Date / LastChangedDate</li>\n<li>Revision / Rev / LastChangedRevision</li>\n<li>Author / LastChangedBy</li>\n<li>HeadURL / URL</li>\n<li>Id</li>\n</ul>\n\n<p>The keywords are case sensitive, and remember to surround them with $.</p>\n'}]
['https://Stackoverflow.com/questions/39770', 'https://Stackoverflow.com', 'https://Stackoverflow.com/users/572/']