SVG:Namespace

Declare namespaces for SVG and XLink

The namespace declaration for SVG is required. If you don't specify it, nothing will be rendered. The XLink namespace is required if you use <use/>, <image/>, <a/> ...

• The SVG namespace: http://www.w3.org/2000/svg
• The XLink namespace: http://www.w3.org/1999/xlink

A simple SVG file may look like this:

<?xml version="1.0" standalone="no"?>
<svg xmlns="http://www.w3.org/2000/svg" 
    xmlns:xlink="http://www.w3.org/1999/xlink">
 <title>title of drawing</title>

</svg>

Declare DOCTYPE for SVG

Similarly, declaring a correct DOCTYPE for .svg files is important as well, instances have been observed where an SVG file without namespace and incorrect doctype did work in Adobe SVG, but with the namespace added it didn’t work, until the DOCTYPE was corrected as well. The doctype is supposed to be:

<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">

This should solve the cases where the addition of the namespaces required by Mozilla breaks rendering with Adobe SVG.

use namespace-aware methods in javascript

when using js, make sure you use the namespace aware methods like:

• getElementsByTagNameNS()
• createElementNS()
• setAttributeNS()
• getAttributeNS()
• ...

svg elements are in the svg namespace. svg attributes are in the null namespace. for example, to dynamically create an <image> element, do it like this:

const svgns="http://www.w3.org/2000/svg";
const xlinkns="http://www.w3.org/1999/xlink";
var newIM=document.createElementNS(svgns,"image");
newIM.setAttributeNS(null,"width",100);
newIM.setAttributeNS(null,"height",100);
newIM.setAttributeNS(xlinkns,"href","bild2.png");