Example
<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<circle r="30" cx="100" cy="100" fill="#ff0000" stroke="#00ff00" />
<rect x="200" y="200" width="50" height="50" fill="#ffff00" stroke="#00ffff" />
</svg>
Same as above using shorthand hexadecimal form:
<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<circle r="30" cx="100" cy="100" fill="#f00" stroke="#0f0" />
<rect x="200" y="200" width="50" height="50" fill="#ff0" stroke="#0ff" />
</svg>
