What's the meaning of the non numerical values in the XFL's edge definition?

Question

XFL is the new uncompressed ADOBE FLASH (CS5) source file, it consists from XML definitions, most of them are clear but unfortunately, the important one are strange.

Answer 1

!(x,y) moveTo

/(x,y)+ lineTo

|(x,y)+ lineTo

[(x1 y1 ex ey)+ curveTo (quadratic)

](x1 y1 ex ey)+ curveTo (quadratic)

((pBCPx pBCPy)? ; x1 y1 x2 y2 ex ey (({Q,q,P,p})? x y)+ curveTo (cubic start)

)(nBCPx nBCPy)? ; curveTo (cubic end)

Sn selection (n=bitmask, 1:fillStyle0, 2:fillStyle1, 4:stroke)

#aaaaaa.bb is a signed fixed point 32 bit number