Code:

<?xml version="1.0" encoding="UTF-8" ?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <xsd:element name="paket">
    <xsd:annotation>
      <xsd:documentation>
        A sample element
      </xsd:documentation>
    </xsd:annotation>
    <xsd:complexType>
      <xsd:sequence>
        <xsd:element name="devojke">
          <xsd:complexType>
            <xsd:sequence>
              <xsd:element name="devojka" maxOccurs="unbounded" minOccurs="0">
                <xsd:complexType>
                  <xsd:attribute name="id"/>
                  <xsd:attribute name="sifoni"/>
                </xsd:complexType>
              </xsd:element>
            </xsd:sequence>
          </xsd:complexType>
        </xsd:element>
        <xsd:element name="momci">
          <xsd:complexType>
            <xsd:sequence>
              <xsd:element name="momak" maxOccurs="unbounded" minOccurs="0">
                <xsd:complexType>
                  <xsd:sequence>
                    <xsd:element name="devojka" maxOccurs="unbounded">
                      <xsd:complexType>
                        <xsd:attribute name="refId"/>
                      </xsd:complexType>
                    </xsd:element>
                  </xsd:sequence>
                  <xsd:attribute name="id"/>
                  <xsd:attribute name="ime"/>
                </xsd:complexType>
              </xsd:element>
            </xsd:sequence>
          </xsd:complexType>
        </xsd:element>
      </xsd:sequence>
    </xsd:complexType>
  </xsd:element>
</xsd:schema>

Code:

<?xml version="1.0" encoding="UTF-8" ?>
<paket>
  <devojke>
    <Xdevojka id="1" sifoni="4"/> <!-- NAMERNA GRESKA -->
    <devojka id="2" sifoni="5"/>
    <devojka id="3" sifoni="6"/>
  </devojke>
  <momci>
    <momak id="1" ime="Goran">
      <devojka refId="1"/>
      <devojka refId="2"/>
    </momak>
    <momak id="2" ime="Mixailo">
      <devojka refId="2"/>
      <devojka refId="3"/>
    </momak>
  </momci>
</paket>

Code:

    private void validacijaXML() {
        
        try {

                   // Parse an XML document into a DOM tree.
                   DocumentBuilder parser =
                       DocumentBuilderFactory.newInstance().newDocumentBuilder();
                    org.w3c.dom.Document document = parser.parse(new File("test.xml"));

                   // Create a SchemaFactory capable of understanding WXS schemas.
                   SchemaFactory factory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
            

                   // Load a WXS schema, represented by a Schema instance.
                   Source schemaFile = new StreamSource(new File("../Shema/xmlSema.xsd"));
                   Schema schema = factory.newSchema(schemaFile);

                   // Create a Validator object, which can be used to validate
                   // an instance document.
                   Validator validator = schema.newValidator();

                   // Validate the DOM tree.
                   validator.validate(new DOMSource(document));

               } catch (ParserConfigurationException e) {
                   // exception handling
                    System.out.println("Bla1!");
               } catch (SAXException e) {
                   // exception handling - document not valid!
                   System.out.println("Nije validan xml!");
               } catch (IOException e) {
                   // exception handling
                    System.out.println("Bla2!");
               }       
    }