35a36,51
> function HasXmlNS() {
>   if (content.document.documentElement.namespaceURI != null) {
>     // xml document
>     return true;
>   } else {
>     // html tagsoup
>     return false;
>   }
> }
> 
> // Resolves default/root namespace
> 
> function nsResolver(prefix) {
>   return content.document.documentElement.namespaceURI;
> }
> 
39,41c55,57
< 
<   var query_1 = "//link[@type='application/rdf+xml']";
<   var result = document.evaluate(query_1, content.document, null, XPathResult.ANY_TYPE, null);
---
>   var nsPrefix = HasXmlNS() ? "default:" : "";
>   var query_1 = "//"+nsPrefix+"link[@type='application/rdf+xml']";
>   var result = document.evaluate(query_1, content.document, nsResolver, XPathResult.ANY_TYPE, null);
44c60
<   var buf = ""
---
>   var buf = "";
98c114,115
<   var query_1 = "//link[@type='application/rdf+xml'";
---
>   var nsPrefix = HasXmlNS() ? "default:" : "";
>   var query_1 = "//"+nsPrefix+"link[@type='application/rdf+xml'";
104c121
<   var result = document.evaluate(query_1+query_2, content.document, null, XPathResult.ANY_TYPE, null);
---
>   var result = document.evaluate(query_1+query_2, content.document, nsResolver, XPathResult.ANY_TYPE, null);