Looks like a bit mask, they're fairly common in EQ structures, you use bitwise or to combine the bit flags and bitwise and for comparison.
Each flag has a value that has a specific orientation in binary
1 00000001
2 00000010
4 00000100
8 00001000
16 00010000
32 00100000
64 01000000
128 10000000
In this situation say you wanted to combine type 8(128) and type 7(64)
10000000 (128) OR
01000000 (64)
---------
11000000 (192)
You'll notice that 64+128 is 192 so you can create your masks easily by just adding the values you want together if you don't have the patience to deal with the binary =p. Course the masks have to be correct or bad things will happen
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