<?xml version="1.0" encoding="UTF-8"?>
   <XFDL xmlns="http://www.ibm.com/xmlns/prod/XFDL/7.1"
      xmlns:xfdl="http://www.ibm.com/xmlns/prod/XFDL/7.1"
      xmlns:xforms="http://www.w3.org/2002/xforms">
      <globalpage sid="global">
         <global sid="global">
            <xformsmodels>
               <model xmlns="http://www.w3.org/2002/xforms">
                  <instance>
                     <data xmlns="">
                        <p1>35</p1>
                        <p2></p2>
                        <p3></p3>
                     </data>
                  </instance>
               </model>
            </xformsmodels>
            <bgcolor>lightgrey</bgcolor>
         </global>
      </globalpage>
      <page sid="PAGE1">
         <global sid="global">
            <label>Pythagorean Theorem Form</label>
            <bgcolor>cornsilk</bgcolor>
            <fontinfo>
               <fontname>Times</fontname>
               <size>24</size>
               <effect>plain</effect>
            </fontinfo>
         </global>
         <field sid="side1">
            <xforms:input ref="a">
               <xforms:label>Enter length of side 1:</xforms:label>
            </xforms:input>
            <labelfontinfo>
               <fontname>Times</fontname>
               <size>24</size>
               <effect>bold</effect>
            </labelfontinfo>
         </field>
         <field sid="side2">
            <xforms:input ref="b">
               <xforms:label>Enter length of side 2:</xforms:label>
            </xforms:input>
            <labelfontinfo>
               <fontname>Times</fontname>
               <size>24</size>
               <effect>bold</effect>
               </labelfontinfo>
         </field>
         <field sid="Hypotenuse">
            <xforms:input ref="c">
               <xforms:label>The hypotenuse length is:</xforms:label>
            </xforms:input>
            <labelfontinfo>
               <fontname>Times</fontname>
               <size>24</size>
               <effect>bold</effect>
               </labelfontinfo>
            <readonly>on</readonly>
         </field>
      </page>
   </XFDL>

public class DomParser {
    public static void main(String[] args) throws ParserConfigurationException, SAXException, IOException, TransformerException
    {
        
        
            DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
            DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder();
            Document document = documentBuilder.parse("/home/alexander/files/example.xfdl");
 
            //Получаем корневой элемент
            Node root = document.getFirstChild();
        
            String p1dubl = document.getElementsByTagName("p1").toString();
           
            String p1 = document.getElementsByTagName("p1").item(0).getNodeValue();
            System.out.println(p1dubl.indexOf(0));

}
}

public class DomParser {
    public static void main(String[] args) throws ParserConfigurationException, SAXException, IOException, TransformerException
    {
        
        
            DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
            DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder();
            Document document = documentBuilder.parse("/home/alexander/files/example.xfdl");
 
            //Получаем корневой элемент
            Node root = document.getFirstChild();
        
            String p1dubl = document.getElementsByTagName("p1").item(0).toString();
           
            String p1 = document.getElementsByTagName("p1").item(0).getNodeValue();
            System.out.println(p1dubl);

}
}