#Define amount of space for displaying attribute values:
SET cmDisplayHeight:2cm
SET cmDisplayHeight2:4cm

#read "Modelling direction" and "Reference overview settings" attributes [via corresponding expression attributes]:  
AVAL modDirection:"_Modelling_direction_"
AVAL sREFERENCE_OVERVIEW_SETTINGS:"_REFERENCE_OVERVIEW_SETTINGS_"

#define seperators for "Reference overview settings" attribute:
SET sSepLine:"\n"
SET sSepToken:"|"

#------------------------------
# Vertical navigation overview:
#------------------------------  
IF (modDirection = "vertical")
{
  SET cmX:0.08cm
  SET cmY:-0.75cm
  FONT "Arial" h:8pt color:black
  PEN color:darkgray outline
  FOR sLaneInfo in: (sREFERENCE_OVERVIEW_SETTINGS) sep: (sSepLine)
  {
    SET sLaneName:(token(sLaneInfo, 0, sSepToken))
    SET cmLaneSize:("_size_" + sLaneName + "_")
    AVAL set-default: "2"  sLaneSize: ( cmLaneSize)	
    SET laneSize: ( (CM VAL sLaneSize)*5)

    SET bShowLane: "No"
    AVAL set-default: "No" bShowLane:("_disp_" + sLaneName + "_")
    IF (bShowLane = "Yes")
    {
      IF (sLaneName != "Modelling") {
          ATTRBOX (sLaneName)  line-break:rigorous x:abs:(cmX) y:(cmY) w:l:(laneSize - 0.16cm) h:t:(cmDisplayHeight)
		  ATTR (sLaneName)  format:"%o %m" x:abs:(cmX) y:(cmY) w:l:(laneSize - 0.16cm) h:t:(cmDisplayHeight) line-break:rigorous
      }
        SET cmX:(cmX + laneSize)                                                
    }
  }
}

#-------------------------------
# Horizontal navigation overview
#-------------------------------
ELSE {
  FONT h:12pt bold
  TEXTBOX "A" x:1cm y:0.2cm
  SET cmY:(texty2 + 2.3cm)
  SET cmX:-1.6cm
  FONT "Arial" h:8pt color:black
  PEN color:darkgray outline

  FOR sLaneInfo in:(sREFERENCE_OVERVIEW_SETTINGS) sep:(sSepLine)
  {
    SET sLaneName:(token(sLaneInfo, 0, sSepToken))
    SET cmLaneSize:("_size_" + sLaneName + "_")
    AVAL set-default: "2"  sLaneSize: ( cmLaneSize)	
    SET laneSize: ( (CM VAL sLaneSize)*5)
	  
    SET bShowLane: "No"
    AVAL set-default: "No" bShowLane:("_disp_" + sLaneName + "_")

    IF (bShowLane = "Yes")
    {
      IF (sLaneName != "Modelling") {
			ATTRBOX (sLaneName)  line-break:rigorous x:(cmX) y:abs:(cmY) w:l:(cmDisplayHeight2) h:(laneSize - 0.16cm)
            ATTR (sLaneName) format:"%o %m" x:(cmX) y:abs:(cmY) w:l:(cmDisplayHeight2) h:t:(laneSize - 0.16cm) line-break:rigorous
      }
      SET cmY: (cmY + laneSize)          
    }
  }  
}