var d3_nsPrefix = {

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/"

};

d3.ns = {

prefix: d3_nsPrefix,
qualify: function(name) {
  var i = name.indexOf(":"),
      prefix = name;
  if (i >= 0) {
    prefix = name.substring(0, i);
    name = name.substring(i + 1);
  }
  return d3_nsPrefix.hasOwnProperty(prefix)
      ? {space: d3_nsPrefix[prefix], local: name}
      : name;
}

};