var me = UI.authn.currentUser() Function: Render a single trip
function renderTrip (subject, thisDiv) {
      var query = new $rdf.Query(UI.utils.label(subject))
      var vars = [ 'date', 'transaction', 'comment', 'type', 'in_USD' ]
      var v = { }
      vars.map(function (x) { query.vars.push(v[x] = $rdf.variable(x)) }) // Only used by UI
      query.pat.add(v['transaction'], TRIP('trip'), subject)

      var opt = kb.formula()
      opt.add(v['transaction'], ns.rdf('type'), v['type']) // Issue: this will get stored supertypes too
      query.pat.optional.push(opt)

      query.pat.add(v['transaction'], UI.ns.qu('date'), v['date'])

      opt.add(v['transaction'], ns.rdfs('comment'), v['comment'])
      query.pat.optional.push(opt)

      // opt = kb.formula();
      query.pat.add(v['transaction'], UI.ns.qu('in_USD'), v['in_USD'])
      // query.pat.optional.push(opt);

      var calculations = function () {
        var total = {}
        var trans = kb.each(undefined, TRIP('trip'), subject)
        // complain("@@ Number of transactions in this trip: " + trans.length);
        trans.map(function (t) {
          var ty = kb.the(t, ns.rdf('type'))
          // complain(" -- one trans: "+t.uri + ' -> '+kb.any(t, UI.ns.qu('in_USD')));
          if (!ty) ty = UI.ns.qu('ErrorNoType')
          if (ty && ty.uri) {
            var tyuri = ty.uri
            if (!total[tyuri]) total[tyuri] = 0.0
            var lit = kb.any(t, UI.ns.qu('in_USD'))
            if (!lit) {
              complain('    @@ No amount in USD: ' + lit + ' for ' + t)
            }
            if (lit) {
              total[tyuri] = total[tyuri] + parseFloat(lit.value)
              // complain('      Trans type ='+ty+'; in_USD "' + lit
              //       +'; total[tyuri] = '+total[tyuri]+';')
            }
          }
        })
        var str = ''
        var types = 0
        var grandTotal = 0.0
        for (var uri in total) {
          str += UI.utils.label(kb.sym(uri)) + ': ' + total[uri] + '; '
          types++
          grandTotal += total[uri]
        }
        complain('Totals of ' + trans.length + ' transactions: ' + str, '') // @@@@@  yucky -- need 2 col table
        if (types > 1) complain('Overall net: ' + grandTotal, 'text-treatment: bold;')
      }
      var tableDiv = UI.table(myDocument, {'query': query, 'onDone': calculations})
      thisDiv.appendChild(tableDiv)
    }