A.4 Defs, View, and Metadata
Now let’s descend from the root element of a typical Inkscape SVG document to see what else is in there.
First comes the
defs element. As part of the SVG standard, it is a storage bin for things that, by themselves, are not displayed on the canvas, but may be used by other elements that are. This includes gradients, patterns, markers (arrowheads, 9.5 Markers), clipping paths, masks, filters, and so on. They are all stored as child elements of the
defs element. The SVG specification allows arbitrarily many
defs elements placed almost anywhere in the document, but Inkscape always uses a single
defs under the root
svg. Here’s an example
defs element containing a gradient:
<defs id="defs4"> <linearGradient inkscape:collect="always" ...