Hi Berco,
Anything is possible, but it is difficult. Most of the conversion is done in the Batik library so it would require writing a custom driver that does its own iteration through the layer and item lists. This is what I did in SkyJUMP's print to pdf driver in order to implement pdf layers.
First I would verify that data attributes are supported in SVG. This is a new concept to me.
regards,
Larry Becker
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Larry Becker
Integrated Systems Analysts, Inc.