dream deferred赏析:这是什么布线软件的数据格式？

这是一个芯片单元的描述：
最开始的xor2x1应该是单元名
之后8.100*6.400是尺寸
再之后描述了y,b,a三个插口

我想知道rect后的数据是什么意思
此外,obs是什么

如果可以的话，大家还能不能告诉我这是什么布线软件的数据格式呢?

macro xor2x1
origin 0.000 0.000 ;
size 8.100 by 6.400 ;
pin y
direction output ;
port
layer metal1 ;
rect 6.590 4.240 6.910 4.560 ;
rect 7.490 4.240 7.810 4.560 ;
rect 7.490 3.440 7.810 3.760 ;
rect 7.490 1.840 7.810 2.160 ;
end
end y
pin b
direction input ;
port
layer metal1 ;
rect 2.090 2.640 2.410 2.960 ;
end
end b
pin a
direction input ;
port
layer metal1 ;
rect 2.090 3.440 2.410 3.760 ;
rect 2.990 3.440 3.310 3.760 ;
end
end a
obs
layer metal1 ;
rect 7.490 1.430 7.870 2.160 ;
rect 7.490 2.640 7.870 2.960 ;
rect 7.490 3.440 7.870 3.760 ;
rect 7.490 4.240 7.870 4.560 ;
rect 7.490 5.040 7.810 5.540 ;
rect 6.590 0.860 6.910 1.360 ;
rect 6.590 1.840 6.910 2.160 ;
rect 6.590 2.640 6.910 2.920 ;
rect 6.590 4.140 6.910 4.560 ;
rect 6.590 5.040 6.910 5.540 ;
rect 5.690 3.440 6.050 3.760 ;
rect 5.690 1.100 6.010 1.360 ;
rect 5.690 1.840 6.010 2.160 ;
rect 5.690 2.640 6.010 2.960 ;
rect 5.690 4.240 6.010 4.560 ;
rect 5.690 5.040 6.010 5.540 ;
rect 4.790 1.100 5.110 1.360 ;
rect 4.790 1.840 5.110 2.160 ;
rect 4.790 2.640 5.110 2.960 ;
rect 4.790 3.440 5.110 3.760 ;
rect 4.790 4.240 5.110 4.560 ;
rect 4.790 5.040 5.110 5.540 ;
rect 3.890 0.860 4.210 1.360 ;
rect 3.890 1.840 4.210 2.160 ;
rect 3.890 2.640 4.210 2.960 ;
rect 3.890 3.440 4.210 3.760 ;
rect 3.890 4.240 4.210 4.560 ;
rect 3.890 5.040 4.210 5.540 ;
rect 2.990 0.860 3.310 1.360 ;
rect 2.990 1.840 3.310 2.160 ;
rect 2.990 2.640 3.310 2.960 ;
rect 2.990 4.240 3.310 4.560 ;
rect 2.990 5.040 3.310 5.540 ;
rect 2.090 0.860 2.410 1.360 ;
rect 2.090 1.840 2.410 2.160 ;
rect 2.090 4.240 2.410 4.560 ;
rect 2.090 5.040 2.410 5.540 ;
rect 0.690 1.660 1.510 2.160 ;
rect 0.690 2.640 1.510 2.960 ;
rect 0.690 3.440 1.510 3.760 ;
rect 0.690 4.240 1.510 4.560 ;
rect 1.190 5.040 1.510 5.540 ;
layer via12 ;
rect 7.470 1.820 7.830 2.180 ;
end
end xor2x1