excluding image format according to output

[Camille Bégnis <camille@neodoc.biz>]

Hello,

I transform a document to both HTML and PDF (through xep), and would 
like to be able to use PNG images for HTML output and SVG or PDF for PDF 
output (for vector graphics).

Do stylesheets provide a mechanism to select the image with the 
appropriate format?

Camille.
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