the SVG 1.2 XML-based extension mechanism on IBM's
"The first Scalable Vector Graphics specification (SVG 1.0) laid the standard for XML-expressed two-dimensional interactive and animated graphics. Since then, the W3C SVG Working Group has made efforts to take SVG a step further with a strong focus on enhancing features that ease the work of using SVG for Web and desktop application development. One of the most promising features introduced in SVG 1.2 is Rendering Custom Content (RCC) -- it offers a clean XML-centric extension mechanism to mix and match different XML namespaces within an SVG document. This article takes you through the creation of a simple push-button widget while introducing the RCC mechanism.
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