Animate SVG element every x seconds

Question

Introduction

I know some basic animation techniques for SVG using both Javascript and DOM <animate> element. So I have created this SVG, but I can't figure it out how trigger the animation every x seconds without too much code. I tried begin="4s" but it only wait the first time.

Question:

There is a DOM property like begin or dur, but to define an interval in seconds? Which is the better way to achieve this?

What I have tried:

<animateTransform attributeName="transform" additive="sum" attributeType="XML" 
type="rotate" dur="1s" repeatCount="indefinite" from="0 54.2 43.3" 
to="360 54.2 43.3" begin="3s" fill="freeze"/>

Complete example here: SVG Fiddle

Notes:

• I already checked SVG Spec
• Add some Javascript code is an option
• Using CSS3 is an option too

Answer 1

<g> 
    <rect x="0" y="0" width="30" height="20" fill="#f83"/>      
    <animateTransform id="id1" attributeName="transform" additive="sum" 
     type="scale" calcMode="linear" begin="4;id1.end+4" dur="2" keyTimes="0;1" 
     values="1 1;2 2" fill="freeze" />

</g>

here animation begin is specified with relative to animation end, in this way your animation will always wait for your specified time(here 4 sec) and start playing again ...

try this, all the best

UPDATE

if you able to use id.end instead of id.end+some_clock_value then use keyTimes and values attribute correctly, replace your rotation animation with following animateTransform and see if you get the output you want,

<animateTransform id="id1" attributeName="transform" additive="sum" 
     type="rotate" calcMode="linear" begin="0" dur="4" 
     repeatCount="indefinite"   keyTimes="0;0.75;1" 
     values="0 54.2 43.3 ; 0 54.2 43.3 ; 360 54.2 43.3" fill="freeze" />