Comment 3 for bug 919952

> does this "layer groups" part of the svg specs for handling
> pages or does it deviate?

Note: Neither the current SVG 1.1 specification (nor the roadmap for SVG 2.0) does have a standardized 'layers' feature either:
<http://wiki.inkscape.org/wiki/index.php/SVG_WorkingGroup#Areas_of_Inkscape_Interest>

Inkscape has implemented layers as regular SVG groups <g> with an attribute in Inkscape's namespace which makes Inkscape treat them as layers. For other SVG viewers, these are just regular groups, not "layers".

The 'inkscape-pages' extension is based on Inkscape's implementation of layers (groups with a special attributes), IIRC it simulates 'pages' by hiding everything and only showing a single layer representing the current page. Changing to another page must be done with a script (part of the extension).

In short: the implementation is fully compliant with SVG 1.1 but other SVG viewers will neither know about layers nor pages: they will only see several levels of (possibly nested) groups, some of the hidden (invisible), some not.

> I will also try inkscape-pages extension to create a book.

Just a reminder: for now, please report any issues with the extension in its own issue tracker at sf.net.
See the README file distributed with the extension (also displayed on the sf.net site) for documentation and basic usage.