XOM API for Processing XML with Java

[Lovenish Goyal <lovenishgoyal AT gmail.com>]

I am trying to print some string as a xQuery output from java code but 
output is generating with some garbage/additional information.

Java Code

                Nodes results = XQueryUtil.xquery(doc_from, query);
                String outPut = "";
                for (int i = 0; i < results.size(); i++) {
                        outPut += results.get(i).toXML();       
                }
                System.out.println("output: " + conditionIfElseOutput);

XML file 

<?xml version="1.0" encoding="UTF-8"?>

<bookstore>

<book category="COOKING">
  <title lang="en">Everyday Italian</title>
  <author>Giada De Laurentiis</author>
  <year>2005</year>
  <price>30.00</price>
</book>

<book category="CHILDREN">
  <title lang="en">Harry Potter</title>
  <author>J K. Rowling</author>
  <year>2005</year>
  <price>29.99</price>
</book>

<book category="WEB">
  <title lang="en">XQuery Kick Start</title>
  <author>James McGovern</author>
  <author>Per Bothner</author>
  <author>Kurt Cagle</author>
  <author>James Linn</author>
  <author>Vaidyanathan Nagarajan</author>
  <year>2003</year>
  <price>49.99</price>
</book>

<book category="WEB">
  <title lang="en">Learning XML</title>
  <author>Erik T. Ray</author>
  <year>2003</year>
  <price>39.95</price>
</book>

</bookstore>

xQuery:

let $document := //bookstore
        for $x in $document/book
        return 
                if ($x/price>30)
                        then 
                                string(123)
                else ()

Output:

<item:atomic-value xmlns:item="http://dsd.lbl.gov/nux"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:type="xs:string">123</item:atomic-value><item:atomic-value 
xmlns:item="http://dsd.lbl.gov/nux"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:type="xs:string">123</item:atomic-value>


Why is this happening? I am expecting that I should get 123... back.