+- roadmap towards SVG support: see 1/25/2010 Mark Edgington email & reply
+ (1) export to SVG (using pages and groups for pages and layers;
+ use comment tags to make export nonlossy;
+ (2) import from this subset of SVG;
+ (3) add SVG to the file-open and save formats
+
+- roadmap towards PDF encapsulation: see 1/29/2010 forum posts
+ When exporting to PDF, don't just append our annotations as PDF code but
+ also include the .xoj file within the pdf, and ensure the initial pdf is
+ well-delimited from the rest. When opening a PDF that includes such
+ markings, discard the annotation part of the PDF and open the embedded xoj
+ instead. Later, offer such PDF as a file-open and save format (even when
+ there's no PDF background being annotated!!).
+
+*** should have Open, Save, Save As manipulate at least 3 formats:
+ - XOJ
+ - PDF with embedded xoj file in an object (opens with annot. in PDF viewer,
+ with background only + separate xoj in xournal)
+ - SVG (subset only)
+ additionally, should have "print to": printer, PDF, SVG, bitmap.
+
+- allow djvu and other backgrounds (but then can't export to PDF)