parse form data to XML

[Jesse Wu]

Sorry for the newbie question, I am still in the process of learning XQuery.
What will be the the best way to get HTML form post data into a XML.
For example:

get-data returns

v1=v1&a1=a1&v2=v2&a2=a2&v3=v3&a3=a3& .... v10=v10&a10=a10

need to get it into XML as

<row attr="a1" >v1<row>
<row attr="a2" >v2<row>
<row attr="a3" >v3<row>
....

<row attr="a10" >v10<row>

tried to use tokenize then string-before and after =, but could not
figure out how to get the loop to do 2 elements for each row.

    {for $parsed-query-term in $parsed-data
               let $parse-query-value := substring-after($parsed-query-term,"=")
               return <row attr="{???}">{xmldb:decode($parse-query-value)}</row>
               }

Thank you or your help. -Jes