@
  @ <p>Note:  To avoid a redirect loop or other problems, this entry must
  @ begin with "/" and it must specify a valid page.  For example,
  @ "<b>/home</b>" will work but "<b>home</b>" will not, since it omits the
  @ leading "/".</p>
  @ <p>(Property: "index-page")
  @ <hr>
  @ <p>Extra links to appear on the <a href="%R/sitemap">/sitemap</a> page.
  @ Often these are filled in with links like
  @ <p>Extra links to appear on the <a href="%R/sitemap">/sitemap</a> page,
  @ as sub-items of the "Home Page" entry, appearing before the
  @ "/doc/trunk/doc/<i>filename</i>.md" so that they refer to
  @ embedded documentation, or like "/wiki/<i>pagename</i>" to refer
  @ to wiki pages.
  @ "Documentation Search" entry (if any).  In skins that use the /sitemap
  @ page to construct a hamburger menu dropdown, new entries added here
  @ will appear on the hamburger menu.
  @
  @ <p>This setting should be a TCL list divided into triples.  Each
  @ triple defines a new entry:
  @ Leave blank to omit.
  @ <p>
  @ <ol>
  entry_attribute("Documentation Index", 40, "sitemap-docidx", "smdocidx",
                  "", 0);
  @ (Property: sitemap-docidx)<br>
  entry_attribute("Download", 40, "sitemap-download", "smdownload",
                  "", 0);
  @ (Property: sitemap-download)<br>
  entry_attribute("License", 40, "sitemap-license", "smlicense",
                  "", 0);
  @ (Property: sitemap-license)<br>
  entry_attribute("Contact", 40, "sitemap-contact", "smcontact",
                  "", 0);
  @ <li> The first term is the display name of the /sitemap entry
  @ <li> The second term is a hyperlink to take when a user clicks on the
  @      entry.  Hyperlinks that start with "/" are relative to the
  @      repository root.
  @ <li> The third term is an argument to the TH1 "capexpr" command.
  @      If capexpr evalutes to true, then the entry is shown.  If not,
  @      the entry is omitted.  "*" is always true.
  @ </ol>
  @
  @ <p>The default value is blank, meaning no added entries.
  @ (Property: sitemap-extra)
  @ <p>
  textarea_attribute("Custom Sitemap Entries", 8, 80, 
      "sitemap-extra", "smextra", "", 0);
  @ (Property: sitemap-contact)
  @ <hr />
  @ <p><input type="submit"  name="submit" value="Apply Changes" /></p>
  @ </div></form>
  db_end_transaction(0);
  style_finish_page();
}