login_check_credentials();
  if( !g.okRead ){ login_needed(); return; }

  style_header("Branches");
  style_submenu_element("Timeline", "Timeline", "brtimeline");
  login_anonymous_available();
  compute_leaves(0, 1);
  style_sidebox_begin("Nomenclature:", "33%");
  @ <ol>
  @ <li> An <b>open branch</b> is a branch that has one or
  @ more <a href="leaves">open leaves.</a>
  @ The presence of open leaves presumably means
  @ that the branch is still being extended with new check-ins.</li>
  @ <li> A <b>closed branch</b> is a branch with only
  @ <a href="leaves?closed">closed leaves</a>.
  @ Closed branches are fixed and do not change (unless they are first
  @ reopened)</li>
  @ </ol>
  style_sidebox_end();

  db_prepare(&q,
    "SELECT DISTINCT value FROM tagxref"
    " WHERE tagid=%d AND value NOT NULL"
    "   AND rid IN leaves"
    " ORDER BY value",
    TAG_BRANCH
  );