onoff_attribute("Allow block-markup in timeline",
                  "timeline-block-markup", "tbm", 0);
  @ <p>In timeline displays, check-in comments can be displayed with or
  @ without block markup (paragraphs, tables, etc.)</p>

  @ <hr>
  onoff_attribute("Use Universal Coordinated Time (UTC)",
                  "timeline-utc", "utc", 0);
  @ <p>Show times as UTC (also sometimes called Greenwich Mean Time (GMT) or
  @ Zulu) instead of in local time.</p>

  @ <hr>
  entry_attribute("Max timeline comment length", 6, 
                  "timeline-max-comment", "tmc", "0");
  @ <p>The maximum length of a comment to be displayed in a timeline.