The Cairo API is similar to what you are designing for OpenVG. The source code is MIT licensed so there is no problem for your group to use it. Cairo is being designed using lessons learned from the SVG design process so that it won't repeat those mistakes.
Cario is funded by large companies like HP, IBM and Redhat and will be making a major appearnce on Linux desktops next year.
Please let us know what is happening with OpenVG. If we can agree on an API Linux with make an excellent, free development platform. http://cairo.freedesktop.org/lists