additional identifier which properly disambiguates the structure view from any other view with the same attributes. This is not an ID, because it is possible to have many references to the same physical structure view from different sequences in an alignment. A structureState element citing the same viewId will appear for each instance. unique id used by jalview to synchronize between stored and instantiated views Tree ID added for binding tree visualization settings to vamsas document trees in jalview 2.4.1