SVG elements
For SVG markup that is stored directly in DITA documents that are validated using DTDs, the SVG elements must use a namespace prefix in order to avoid conflict with DITA-defined elements of the same name. Documents validated using XSD or RELAX NG can default the SVG namespace on the SVG <svg> element. SVG elements that are referenced using the <svgref> element do not need to have a namespace prefix, because they are parsed separately from the DITA documents that refer to them. By default, the SVG domain is configured to use the namespace prefix "svg" for the SVG elements.