- From: Felix Breuer <felix@fbreuer.de>
- Date: 21 Feb 2003 01:20:24 +0100
- To: www-svg@w3.org

Hello! Is it possible to include a "user defined object" in a flow*? If not, would it make sense to include such a facility in SVG 1.2? Let me elaborate: Suppose you have a DocBook document with embedded MathML to which you want to apply an XSLT transformation to yield an SVG document. No matter whether your SVG rendering application supports MathML directly or whether your stylesheet has to do some kind of MathML->SVG conversion: The document will contain flows of text that have MathML formulas as inline elements. How can you place them correctly in an SVG file? Neither SVG content generated from MathML nor MathML itself (via foreignObject) could reside inside a flowSomething. So in any case the stylesheet would have to kind-of reimplement text flows, line breaking etc. just to make the flow mechanism accomodate its custom elements. So, here comes my naive proposal: could some <flow> Element be defined that allows for custom objects to be embedded? As 1.2 states: flow layout is intendet to be some kind of post-processing. The dimensions of a custom object, which resides inside, say, a <g> element, would already be calculated. This element could then be handled like a single glyph and placed accordingly. Of course severaly things are problematic about this concept. By means of which mechanism would the dimensions be calculated and passed on? Can the document author influence them or are they left entirely to the rendering application? How about positioning of the object relative to the baseline? I would just like to ask the working group to consider these questions. I have come across so many APIs, frameworks, etc. which implement great line-flow techniques that are utterly impossible to extend to the placement of something as common as mathematical formulas. I am also sure, that an extendable mechanism would be of use in entirely different contexts. Regards, Felix Breuer -- Felix Breuer <felix@fbreuer.de>

Received on Thursday, 20 February 2003 19:21:28 UTC