Demo type: command line
     Run: login as "oracle" to 'mira'
          cd /localb/oracle/app/oracle/product/8.1.5/xml21/sample
      a) DOM interface:
         i) DTD in XML file:
            java DOMSample class.xml 
            java DOMSample empl.xml
        ii) DTD out of XML file (family.dtd) 
            java DOMSample family.xml
      b) SAX interface:
         i) DTD in XML file:
            java SAXSample class.xml
            java SAXSample empl.xml 
        ii) DTD out of XML file (family.dtd)
            java SAXSample family.xml
      c) XSL Stylesheet (iden.xsl)
         i) DTD in XML file:
            java XSLSample iden.xsl class.xml
            java XSLSample iden.xsl empl.xml
        ii) DTD out of XML file (family.dtd)
            java XSLSample iden.xsl family.xml