http://tutorials.jenkov.com/svg/index.html
http://www.w3schools.com/svg/
http://www.svgbasics.com/rotate.html
https://sarasoueidan.com/blog/svg-coordinate-systems/
SVG + Angular
http://alexandros.resin.io/angular-d3-svg/
Embed Image in SVG
<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<image width="20" height="20" xlink:href="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUAAAAFCAYAAACNbyblAAAAHElEQVQI12P4//8/w38GIAXDIBKE0DHxgljNBAAO9TXL0Y4OHwAAAABJRU5ErkJggg=="/>
</svg>