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  (heading "EXAMPLE DTM CONSTRAINT")

    (label
	(position 2 4)
	(text "This example constrains blocks to those occurring below the natural land surface which is")
    )
    (label
	(position 2 5)
	(text "represented by a digital terrain model called nls1.dtm.  Only one trisolation may be")
    )
    (label
	(position 2 6)
	(text "specified for a DTM constraint and in the absence of a specific object and trisolation")
    )
    (label
	(position 2 7)
	(text "number this will default to the first trisolation in the dtm file.")
    )
  
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    (position 2 9) 
    (foreground (user_option "form_text_highlight"))
    (text "REFERENCE - parenthesised items are optional")
  )
  
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      (label (position 11 0) (text "ABOVE"))
      (label (position 21 0) (foreground (user_option "form_text_highlight")) 
        (text "DTM"))
      (label (position 37 0) (text "loc"))
      (label (position 45 0) (text "id"))
      (label (position 52 0) (text "(obj)"))
      (label (position 59 0) (text "(tris)")) 
    )
  )
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	(label (position 1 24) (text "y"))
	(label (position 1 25) (text "z"))
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	    (default "")
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  (label (position  2 17) (text "Constraint combination"))
  (label (position  2 18) (text "Save constraint to"))
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