Hi,

I know quite a few tools that support different path types and 
relative coordinates.

Adobe Illustrator and Corel Draw both support both:

see the following d-attribute produced in Illustrator:
d="M57.547,137.113c0,0-24.161-32.886,41.611-32.886s87.249-12.081,84.
564,12.751s-5.37,41.61-16.779,50.335s-20.805,24.162-14.094,44.967s30.
872,29.53,48.993,40.268s33.557,6.04,25.503,30.201s-4.027,32.886-20.
134,42.953s-52.349,8.726-58.389,1.343s-16.778-20.134-36.913-18.792
S7.211,278.053,7.211,278.053v-85.906h89.933v-48.322H0.5v-42.953l36.913
-36.913h96.644l62.751-62.751v58.725h56.041c0,0,27.517,14.765,26.174,
57.047"

Illustrator even uses the h and v commands to optimize path code. 
Corel, as far as I know does not. At least not in version 11. But 
Corel supports relative coordinates.

> I encountered these problems: 
>  
> * An SVG path can be composed of various types of components, like 
>   horizontal/vertical lines, arcs, quadratic or cubic bezier 
curves. 
>   However, the editors usually produce only one type of path 
component 
>   (e.g. cubic bezier curves). 
> * The editors produce only absolute coordinates while SVG allows to 
use 
>   relative ones. 
> * After finishing a path, it cannot be edited again i.e. control 
points 
>   moved or path components inserted/removed.


I don't know what you mean by that. As far as I know all of the 
Graphics tools support re-editing of previously finished pathes.

Andreas






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