[For general info on OpenReader, refer to http://www.openreader.org/ Those interested in following the OpenReader Format Working Group discussion, join the group 'openreader-format' at YahooGroups: http://groups.yahoo.com/group/openreader-format/ ]

The OpenReader format, currently under development by the OpenReader Consortium, will, in its basic form, essentially be an encapsulation of an OEBPS 1.2 Publication. In turn OEBPS 1.2 is based on XHTML 1.1, and provides document extensibility and media fallback mechanisms. For more information on OEBPS 1.2, refer to

http://www.openebook.org/oebps/oebps1.2/download/oeb12-xhtml.htm .

We wish to include support for both SVG and MathML in the OpenReader format.

So what mechanism(s) do the SVG and MathML experts recommend for inclusion of "islands" of SVG and MathML markup within XHTML 1.1 documents? Also, do SVG and MathML provide their own media fallback mechanisms [see note below], or will we need to provide that?

(I recall seeing an attempt at an XHTML+SVG+MathML DTD/Schema. I also recall reading that using the <object> tag for inclusion of SVG and MathML is not recommended. Are my recollections correct?)

Thanks.

Jon Noring OpenReader Consortium

[Note: A fallback mechanism is a means to specify a media object, such as a PNG or JPG image, to act as an optional alternative to rendering SVG or MathML markup. For example, An OpenReader user agent may use the fallback media object, instead of rendering SVG/MathML when it is not capable of doing so, such as when operating on limited capacity hardware like legacy PDAs.]