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'&' in links not allowed?

I have hyperlinks within cells of a dhtmlxGrid.  The links has parameters like that: 

?func=anzeige&wkid=858861303449936&rub1=Stopfen%20-%20%20Abdeckstopfen&rub2=Tellerstopfen%20aus%20LDPE

Whith '&' in the link, only header is displaying, but no rows. 

Is it a bug or a feature or do I have a knowledge problem? I'm a newbie.

Thanks in advance for any hint!

I've solved it temporarily very simple:

<![CDATA[ <a href="http://www.meinserver-de/cgi-bin/shop_main.cgi?func=anzeige&wkid=858861303449936&rub1=Stopfen%20-%20%20Abdeckstopfen&rub2=Tellerstopfen%20aus%20LDPE">Linkname</a> ]]

But I prefer the "official" solution with special syntax from dhtmlxgrid_excell_link,  so I hope to get an answer. 

The special syntax which I mean is <cell>link^url;^target</cell>

There are two possible issues with & character
a) escaping in XML 
     The next characters are not allowed inside XML data  "<", ">", "&" - they need to be replaced with related entities ( &lt, &gt; &amp; ) or placed inside CDATA section ( your solution above )
b) rendering in HTML
     If you are using & inside href part of cell - it will be processed correctly, but when used as part of HTML it may be treated as start of HTML entity ( IE ) and rendered incorrectly. 
     Grid supports "pure text" column types , such as edtxt,txttxt,rotxt,corotxt - which works as default ones, but process incoming data as text ( which means tags and special chars inside content will be rendered as a text, not as HTML )

Thanks!

My evaluation period is over after a day. With a positive result. ;-)