showLabel="[value]"
The user can toggle the default visibility of any link type's label via this setting. A value of "0" turns the label off and a default of "1" sets the label on (i.e. displayed).
Use the visible attribute to hide both label and arrow in Map view.
The visible value can be further customised within the program at file level via the Attributes:Link Types dialog.
Example:
<linkType name="*untitled" label="" visible="1" showLabel="0" color="#000000" style="0" />
<linkType name="note" visible="1" showLabel="1" color="#666666" style="0" />