The predefined trend indications provided in JViews TGO are those defined in ITU-T X.721.

How to Change the Representation of a Trend Indication

In the following CSS extract, the label for the trend indication NoChange is set to "Unchanged".

object."ilog.tgo.model.IltAlarm/trendIndication"[trendIndication=NoChange] {
  label: "Unchanged";
}