- From: Chris Lilley <chris@w3.org>
- Date: Mon, 10 Oct 2005 18:31:21 +0200
- To: "Andre M. Winter - Vectoreal.com" <andre.winter@vectoreal.com>
- Cc: www-svg@w3.org
On Sunday, October 9, 2005, 5:18:34 PM, Andre wrote: AMWVc> hi, AMWVc> i am writing ab SVG-book for mapping people describing useful features AMWVc> to be used with SVG. one of those are entities. just like CSS there are AMWVc> pros and cons on that topic, but when working e.g. with animations they AMWVc> help a lot. AMWVc> entities need to be defined in the DOCTYPE-tag, (the DOCTYPE declaration is not a tag. Normally i would let that one slide, but you mentioned writing a book so....) AMWVc> but this one seems to AMWVc> get deprecated. so my question is: will there by an entity-like AMWVc> mechanism in SVG1.2+ or will they remain and in this case how may they AMWVc> be defined. You should distinguish the internal DTD subset (ie, the part in the svg file) from the external DTD subset (ie the external file or files that people think of as "the DTD". All XML parsers are required to parse the internal DTD subset. Fetching and pasing the external DTD subset is optional for parsers that do not do DTD validation, which is itself optional. You should also distinguish between parsing and validation. Having got that clear: - SVG 1.2 does not use a DTD for validation - SVG 1.2 files can use an internal DTD subset to declare entities if they wish, just as before. For example (this entity draws a smiley face) <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE svg [ <!ENTITY Smile " <rect x='.5' y='.5' width='29' height='39' fill='black' stroke='red'/> <g transform='translate(0, 5)'> <circle cx='15' cy='15' r='10' fill='yellow'/> <circle cx='12' cy='12' r='1.5' fill='black'/> <circle cx='17' cy='12' r='1.5' fill='black'/> <path d='M 10 19 L 15 23 20 19' stroke='black' stroke-width='2'/> </g> "> ]> <svg xmlns="http://www.w3.org/2000/svg" version="1.2" baseProfile="Tiny"> <desc>This example shows the use of an entity defined in the internal DTD subset. Note that there is no external DTD subset for SVG 1.2, and thus no formal public identifier.</desc> &Smile; </svg> -- Chris Lilley mailto:chris@w3.org Chair, W3C SVG Working Group W3C Graphics Activity Lead Co-Chair, W3C Hypertext CG
Received on Monday, 10 October 2005 16:31:30 UTC