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dhtmlxtree url userdata loading issue

Per your online document: http://www.dhtmlx.com/docs/products/docsExplorer/index.shtml?node=dhtmlxtree&type=smpl
I am interested in using your dhtmlxtree js components for creating an online bookmark. I tried to no avail loading an xml doc with a link e.g.

<item text="another kenmore dryer problem - dryers - appliance repair talk - the appliance blog forums" id="another kenmore dryer problem - dryers - appliance repair talk - the appliance blog forums" im0="iconText.gif" im1="book_titel.gif" im2="book_titel.gif">
<userdata name="myurl">http://www.applianceblog.com/forums/view_topic.php?id=91&forum_id=3&jump_to=4913</userdata>
</item>

If I'm not mistaken, it turned out to be the url link is not XML well formed around where "forum_id=..." is located. Is there anyway to work about this? On another note, is there anyway to load an xml tree from a database string vs. an xml file? Please advise. Thanks.

Valid has few reserved chars ( & < > ) which need to be replaced with entities or included in CDATA so you code will be correct as

<userdata name="myurl">http://www.applianceblog.com/forums/view_topic.php?id=91&amp;forum_id=3&amp;jump_to=4913</userdata>

or

<userdata name="myurl"><![CDATA[http://www.applianceblog.com/forums/view_topic.php?id=91&forum_id=3&jump_to=4913]]></userdata>

>>On another note, is there anyway to load an xml tree from a database string vs. an xml file? Please advise. Thanks.

Actually you need not static XML file, you can load data directly from server side url as
    mygrid.loadXML("some.php");
    ---------------- some.php -----------------
    <?php
       header("Content-type:text/xml");
       .. connect to DB
       .. get necessary data
       .. output as XML

Latest version of dhtmlxTree (1.6) supports loading from JSON/CVS formats