1 d3.ns = {

     2 

     3   prefix: {

     4     svg: "http://www.w3.org/2000/svg",

     5     xhtml: "http://www.w3.org/1999/xhtml",

     6     xlink: "http://www.w3.org/1999/xlink",

     7     xml: "http://www.w3.org/XML/1998/namespace",

     8     xmlns: "http://www.w3.org/2000/xmlns/"

     9   },

    10 

    11   qualify: function(name) {

    12     var i = name.indexOf(":");

    13     return i < 0 ? name : {

    14       space: d3.ns.prefix[name.substring(0, i)],

    15       local: name.substring(i + 1)

    16     };

    17   }

    18 

    19 };