[jancsika]

<svg xmlns="dear user agent, if you happen to run into a problem resolving ambiguities with any of the following tags, please use the namespace for Scalable Vector Graphics and not, say, one of the zero other contexts that xml ninjas will no doubt create over the next two decades of what I can only surmise will be a glorious outpouring of richness and complexity. I mean, we went to the trouble of creating a dang URL for the thing, so it's the least you could do. That is, aside from doing nothing, in which case Hixie will probably write a parser to just handle it. Best wishes, W3C. P.S. Cannot wait to see all the Javascript-driven SVG content that users will upload to social media. Look out, animated gif-- your days are numbered!"><path d="animateYourSVGArcFlagsFTW" /></svg>

[kuschku]

Every editor adds their own xml namespace to SVG. Inkscape’s being probably the most famous one.