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/usr/share/dx/samples/data/labels.dx is in dxsamples 4.4.0-3.

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# This data file is intended to demonstrate the use of the Text module for
# placing annotation labels.

# the positions component
object 1 class array type float rank 1 shape 2 items 4 data follows
    0.0 5.0
    5.0 5.0
    0.0 0.0
    5.0 0.0

# the data component (type string). The shape is the length of the longest
# string + 1.
object 2 class array type string rank 1 shape 11 items 4 data follows
    "this"
    "is"
    "annotation"
    "text"
attribute "dep" string "positions"

# create the field
object 3 class field 
   component "positions" value 1
   component "data" value 2