code: function () {
              /*  determine parameters  */
              var params = $cs.params("_subscriptions", arguments, {
                  name:  { pos: 0, req: true },
                  spec:  { pos: 1, def: {}   }
              });
  
              /*  make an event for matching only  */
              var ev = $cs.event({
                  name:   params.name,
                  spec:   params.spec,
                  target: _cs.nop
              });
  
              /*  find and return all matching subscriptions  */
              var subscriptions = [];
              for (var id in this.__subscription) {
                  if (!_cs.isown(this.__subscription, id))
                      continue;
                  var s = this.__subscription[id];
                  if (ev.matches(s.name, s.spec))
                      subscriptions.push(s);
              }
              return subscriptions;
          }
docs: /*  determine subscriptions (internal)