Define shape size

Use the width and height attributes in the <svg> element to specify the size of the shape:

<svg version="1.1" id="MyShapeType"
     x="0px" y="0px"
     width="100px" height="60px">

Example

<svg version="1.1" id="NewShapeType"
     x="0px" y="0px"
     width="100px" height="60px">
  <rect x="0" y="20" fill="red" width="100" height="20" />
  <rect x="0" y="0" fill="red" width="40" height="60" />
  <rect x="60" y="0" fill="red" width="40" height="60" />
</svg>