Phil,
from this code sample it is clear you should not be using <a> at all.
this isn't a link...
please find attached a file adapted from kevlindev.com
regards
Jonathan Chetwynd
Accessibility Consultant on Media Literacy and the Internet
<?xml version="1.0" encoding="ISO-8859-1" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 20010904//EN"
"http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd" [
<!ATTLIST svg
xmlns:a3 CDATA #IMPLIED
a3:scriptImplementation CDATA #IMPLIED>
<!ATTLIST script
a3:scriptImplementation CDATA #IMPLIED>
]>
<svg xmlns="http://www.w3.org/2000/svg"
xmlns:xlink="http://www.w3.org/1999/xlink">
<script type="text/ecmascript" ><![CDATA[
function changeColor(evt) {
var rect = evt.target;
rect.setAttributeNS(null, "fill", "purple")
}
]]></script>
<rect x="5" y="5" width="40" height="40" fill="red"
onclick="changeColor(evt)"/>
</svg>
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