d3.namespaces
The map of registered namespace prefixes. The initial value is:
{ svg: "http://www.w3.org/2000/svg", xhtml: "http://www.w3.org/1999/xhtml", xlink: "http://www.w3.org/1999/xlink", xml: "http://www.w3.org/XML/1998/namespace", xmlns: "http://www.w3.org/2000/xmlns/" }
Additional prefixes may be assigned as needed to create elements or attributes in other namespaces.
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