Improving the efficiency of SVG in iTasks using deltas

The current implementation of the SVG library in iTasks (Graphics.Scalable) is inefficient, since every time the image changes, the whole image is recalculated using JavaScript on the (sometimes lightweight) clients. More elegant would be sending a delta to the client, that can easily be applied to the image, such that the server does the calculating in the much faster language Clean. Furthermore, not the whole image needs to be rendered, but only the parts that have changed. The challenge is, achieving this improvement with little to no changes to the interface of Graphics.Scalable. That is important, such that old code does not have to be rewritten to work with this version, and users do not need to learn anything new. For this research, Graphics.Scalable is adjusted such that it does just that. Two methods for generating the delta will be introduced. The results are very promising, but not perfect. The faster method of the two needs some assumptions that were not present in the original version, and requires a minor adjustment to the interface.