How to parse an XML file with XS (XML Schema) validation using the DOM API?

if you want to parse an XML file with XS (XML Schema) validation using the DOM API, you can follow these suggestions:

1. Set the validation flag to true on DocumentBuilderFactory object:

      DocumentBuilderFactory f = DocumentBuilderFactory.newInstance();
    f.setValidating(Boolean.parseBoolean(args[1]));

2. Set XML schema language to be XML Schema and turn Namespace Awareness on:

      f.setNamespaceAware(true);
      f.setAttribute("http://java.sun.com/xml/jaxp/properties/schemaLanguage", 
       "http://www.w3.org/2001/XMLSchema");

3. Provide the XML file with XML Schema location (User.xsd) provided, UserXsdError.xml:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<!-- Copyright (c) 2017 FYIcenter.com -->
<fyi:User xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xmlns:fyi="http://fyicenter.com"
  xsi:schemaLocation="http://fyicenter.com User.xsd">
    <fyi:ID>ONE</fyi:ID>
    <fyi:Name>Frank Y. Ivy</fyi:Name>
    <fyi:BirthDate>1970-01-01+00:01</fyi:BirthDate>
    <fyi:Sex>  Male</fyi:Sex>
</fyi:User>

Here is a complete example of parsing an XML with DTD validation using SAX API, DomXmlXsValidation.java:

// Copyright (c) 2017 FYIcenter.com
import java.io.*;
import javax.xml.parsers.*;
import org.w3c.dom.*;

public class DomXmlXsValidation {
   static String dot = "............................................................";
   public static void main(String[] args) throws Exception {
      DocumentBuilderFactory f = DocumentBuilderFactory.newInstance();
      f.setNamespaceAware(true);
    f.setValidating(Boolean.parseBoolean(args[1]));
      f.setAttribute("http://java.sun.com/xml/jaxp/properties/schemaLanguage", 
       "http://www.w3.org/2001/XMLSchema");
    
      DocumentBuilder b = f.newDocumentBuilder();
      Document d = b.parse(new File(args[0]));
      System.out.println("Implementation class:\n   "+d.getClass().getName());

      System.out.println("DOM object elements and text contents:");
    Node n = d.getDocumentElement();
    printText(n, 1);
   }
   public static void printText(Node n, int l) {
      String v = "";
      if (n.getNodeType()==Node.TEXT_NODE) v = n.getTextContent();
      System.out.println(dot.substring(0,l)+n.getNodeName()+":"+v);
    NodeList c = n.getChildNodes();
    for (int i=0; i<c.getLength(); i++) {
       printText(c.item(i),l+1);
    }
   }
}

Compile and run the example program, DomXmlXsValidation.java:

>\fyicenter\jdk-1.8.0\bin\javac DomXmlXsValidation.java

>\fyicenter\jdk-1.8.0\bin\java DomXmlXsValidation UserXsdError.xml true

Warning: validation was turned on but an org.xml.sax.ErrorHandler was not set, 
which is probably not what is desired.  Parser will use a default ErrorHandler 
to print the first 0  errors.  Please call the setErrorHandler method to fix this.

Error: URI=file:UserXsdError.xml Line=6: cvc-datatype-valid.1.2.1: 'ONE' is not a valid value for 'integer'.
Error: URI=file:UserXsdError.xml Line=6: cvc-type.3.1.3: The value 'ONE' of element 'fyi:ID' is not valid.
Error: URI=file:UserXsdError.xml Line=8: cvc-datatype-valid.1.2.1: '1970-01-01+00:01' is not a valid value for 'dateTime'.
Error: URI=file:UserXsdError.xml Line=8: cvc-type.3.1.3: The value '1970-01-01+00:01' of element 'fyi:BirthDate' is not valid.

Implementation class:
   com.sun.org.apache.xerces.internal.dom.DeferredDocumentImpl
DOM object elements and text contents:
.fyi:User:
..#text:

..fyi:ID:
...#text:ONE
..#text:

..fyi:Name:
...#text:Frank Y. Ivy
..#text:

..fyi:BirthDate:
...#text:1970-01-01+00:01
..#text:

..fyi:Sex:
...#text:Male
..#text:

If you run it again with "false", you will not see any validation errors:

>\fyicenter\jdk-1.8.0\bin\java DomXmlXsValidation UserXsdError.xml false

Implementation class:
   com.sun.org.apache.xerces.internal.dom.DeferredDocumentImpl
DOM object elements and text contents:
.fyi:User:
..#text:

..fyi:ID:
...#text:ONE
..#text:

..fyi:Name:
...#text:Frank Y. Ivy
..#text:

..fyi:BirthDate:
...#text:1970-01-01+00:01
..#text:

..fyi:Sex:
...#text:  Male
..#text:

The XML Schema file used in the above test is, User.xsd:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<!-- Copyright (c) 2017 FYIcenter.com -->
<xsd:schema
   xmlns:xsd="http://www.w3.org/2001/XMLSchema"
   xmlns:fyi="http://fyicenter.com"
   targetNamespace="http://fyicenter.com"
   elementFormDefault="qualified">

  <xsd:element name="User">
    <xsd:complexType>
      <xsd:sequence>
        <xsd:element name="ID" type="xsd:integer"/>
        <xsd:element name="Name" type="xsd:string"/>
        <xsd:element name="BirthDate" type="xsd:dateTime"/>
        <xsd:element name="Sex" type="fyi:sexType"/>
      </xsd:sequence>
    </xsd:complexType>
  </xsd:element>

  <xsd:simpleType name="sexType">
    <xsd:restriction base="xsd:NMTOKEN">
      <xsd:enumeration value="Male"/>
      <xsd:enumeration value="Femal"/>
    </xsd:restriction>
  </xsd:simpleType>
</xsd:schema>

⇒ Using XML SAX API with Apache Xerces

⇐ DomXmlDtdValidation.java - DOM Parser with DTD Validation

⇑ Using XML DOM API with Apache Xerces

⇑⇑ FAQ for Apache Xerces XML Parser