Scalable Vector Graphics
From Just Solve the File Format Problem
Scalable Vector Graphics (SVG) is an XML based method for storing vector images.
The specification is open and there is a working group.
The following is an example of a simple svg file:
<svg xmlns="http://www.w3.org/2000/svg" version="1.1"> <circle cx="100" cy="50" r="40" stroke="black" stroke-width="2" fill="red" /> </svg>