#7 Image element in structure

[Peter Becker]

It would be pretty useful to have an image element in
the <structure> part, which is handled similar to
<file>, but gets different attributes, mainly the
width and height should be available for the HTML
output.

An image can at the moment be created with three
approaches: SVG rendering, using the internal renderer
or by copy. SVG would be disallowed as normal process,
in any case the width/height information will be added
by looking at the input data, other attributes like
the alternative text or classes can be added directly
on the element in the structure part.