I'm not aware of any documentation about layering POIs but perhaps consider
these points
a) TYP files can not define a POIs draworder, unlike polygons.
b) There is no guaranteed way of ensuring POI1 always has a higher order
than POI2 - this depends on your Garmin device
However, there is still room for experimentation:
osmc symbols define a foreground and background, ie
background: blue
foreground: yellow diamond
For the level approach to work the background can't be solid but only a
frame with a transparent centre and
all foreground symbols need to fit inside the frame and have the same
dimensions as a background poi
# catch all osmc:symbols and split them into background and foregrounds
#plot backgrounds first
background=blue {0 x 1200a resolution 24 continue) # must use continue
#plot foregrounds last
foreground= yellow_diamond [0 x 1201a resolution 24)
etc
The level approach is probably best suited for spurious symbols like
arches,wheels or hikers
--
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