I need to update database values (nodes)  based on query results. XQuery to get 
users preferences not equal to system preferences sends back results. How do I 
change a user preference value in the database based on results?  xquery 
version "1.0-ml";declare namespace html = 
"http://www.w3.org/1999/xhtml";declare namespace 
pr="http://www.gsa.gov/services/preferences";;<results>{for $syspref in 
doc("system-preferences.xml")/pr:preference/pr:systemPreferences/pr:userDefaultPreference,
    $userpref in 
doc("user-preferences.xml")/pr:preference/pr:userPreferences/pr:userDefaultPreferencewhere
 $syspref/pr:key = $userpref/pr:key and $syspref/pr:value != 
$userpref/pr:valuereturn          <result>         {$syspref/pr:key}         
{$userpref/pr:key}         {$syspref/pr:value}         {$userpref/pr:value}     
    {$userpref/pr:defaultPreference}         </result>}</results> 
Thanks in advance!                                        
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