Google Bookmarks Accelerator for IE8

Question

To Editors: Sorry, I didnt realise the question thing till you pointed it out. Also I didn't know about the appengine tag, I'm assuming it was selected by mistake from that JS autosuggestion box (it usually happens with me, I run a P3) my apologies for that too. I've edited it now, if it doesnt work let me know.

Hi all, I'm making (or at least trying to make) a Google bookmarks accelerator for IE8, but I keep running into "Internet Explorer could not install this accelerator. There was a problem with the Accelerator's information." Does anyone know why this is happening? Here is the code I've made

<?xml version="1.0" encoding="UTF-8" ?> 
<os:openServiceDescription xmlns="http://www.microsoft.com/schemas/openservicedescription/1.0"&gt; 
  <os:homepageUrl>http://www.google.com/bookmarks&lt;/os:homepageUrl&gt; 
  <os:display> 
    <os:description>Add this page to GoogleBookmarks</os:description> 
 <os:name>Add to GoogleBookmarks</os:name> 
    <os:icon>http://www.google.com/favicon.ico&lt;/os:icon&gt; 
  </os:display> 
  <os:activity category="Bookmarks"> 
    <os:activityAction context="document"> 
     <os:execute method="get" action="http://www.google.com/bookmarks/mark?op=add&amp;output=popup"&gt;
  <os:parameter name="bkmk" value="{documentUrl}" />
  <os:parameter name="title" value="{documentTitle}" /> 
  <os:parameter name="annotation" value="{selection}" />

 </os:execute>
    </os:activityAction> 
  </os:activity> 

</os:openServiceDescription>

These are the references I used:

1. MSDN Developers Guide
2. MSDN Format Specification
3. Unofficial Google API (used as a look up so far)

and yes i know that I cannot send document variables between schemes (HTTP -> HTTPS, for example) or between servers in different security zones (Intranet -> Internet etc)

Also, if this is the wrong place, what are the recommended sites and/or forums for xml related posts? (not really questions - but more like full blown detailed rant like posts) Thanks