Peter Moulder wrote:
...Mars actually incorporates merely an SVG-like language...
If you look on the FAQ page, it says;
What advantages does SVG bring to a Mars document?
SVG is an abbreviation for Scalable Vector Graphics, an XML-based, W3C standard language for describing graphics. Many applications and tools can create or manipulate SVG page contents. SVG page content can also be converted to PDF graphic operators using Acrobat 8.0 Professional and the Mars plug-in.
Is SVG animation and scripting supported?
PDF defines a model for scripting and interaction and that is used in Mars documents. PDF graphic content represents static documents so features of SVG related to dynamic graphics or interaction are not supported.
How are high-end print features supported in SVG?
Where SVG does not have sufficient function to support capabilities in PDF, private namespace extensions have been added. Over time, it is hoped that these features will be incorporated into the SVG standard.