The SVG 2.0 Specification adds a 'b' command to path for bearing.

This is going to make some pretty interesting L-System fractals pretty trivial to generate. F, F:=F-F-F+ then at the end replace all F with h10 all + with b90 and all - with b-90, and you're totally done. Update: This did not make it into the SVG 2.0 final Spec.