Mapserver: Symbol and Label collisions

square.svg

test.map

MAP
  NAME SYMBOL_LABEL_COLLISION_TEST
  SIZE 500 500
  EXTENT 0 0 1 1
  IMAGECOLOR 255 255 255

  IMAGETYPE svg

  CONFIG "MS_ERRORFILE" "stderr"

  SYMBOL
    NAME "square_05_05"
    TYPE svg
    IMAGE "./square.svg"
    ANCHORPOINT 0.5 0.5
  END

  LAYER
    TYPE LINE
    STATUS ON
    FEATURE
      POINTS
        0 0
        0.5 0.5
        1 1
      END
      TEXT "HELLO"
    END
    CLASS
       STYLE
         COLOR 255 0 0
       END
       LABEL
        COLOR 150 150 150
        SIZE 50
        ANGLE AUTO
        POSITION CC
        #FORCE TRUE
       END
    END
  END

  LAYER
    TYPE POINT
    STATUS ON
    FEATURE
      POINTS
        0.25 0.25
      END
    END
    CLASS
       STYLE
         SIZE 150
         SYMBOL "square_05_05"
       END
    END
  END

END

Here is the result of rendering this map file with:
shp2img -o ~/Desktop/collision.svg -m collision.map

I expected to see the label in the top-right corner, avoiding the square symbol.

I have modified your example a little bit.

I You add REPEATDISTANCE for the text and then a fake label with transparent text above the svg symbol
I think that You get something that is close to what you are looking for.

If You remove the last fake label block You get the old behavior that the text is written above the symbol.

---

`MAP
NAME SYMBOL_LABEL_COLLISION_TEST
SIZE 500 500
EXTENT 0 0 1 1
IMAGECOLOR 255 255 255

IMAGETYPE svg

CONFIG "MS_ERRORFILE" "stderr"

SYMBOL
NAME "square_05_05"
TYPE svg
IMAGE "./square.svg"
ANCHORPOINT 0.5 0.5
END

LAYER
TYPE LINE
STATUS ON
FEATURE
POINTS
0 0
0.5 0.5
1 1
END
TEXT "HELLO"
END
CLASS
STYLE
COLOR 255 0 0
END
LABEL
COLOR 150 150 150
SIZE 15
ANGLE FOLLOW
POSITION AUTO
REPEATDISTANCE 200
END
END
END

LAYER
TYPE POINT
STATUS ON
FEATURE
POINTS
0.5 0.5
END
END
CLASS
STYLE
SIZE 50
SYMBOL "square_05_05"
END
LABEL
TEXT "X"
COLOR "#00000000"
SIZE 8
POSITION CC
END
END
END

END
`