I do not think there can be any executable code embedded in SVG. The picture is scalable because "objects" are mathematically" defined. A circle, for instance, is defined as a center and a radius. In this way, whatever the zoom, the application (for instance the Web browser) draws a perfect circle. On the contrary, raster images (such as BMPs, PNGs, JPEGs, etc.) basically are matrices of pixels and zooming just makes the pixels larger.

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