  	<!-- DTD document for convert.xml -->    	  
 	
	<!ELEMENT agent (agentname, email, allproperty)>
    <!ELEMENT agentname (#PCDATA)>
    <!ELEMENT email (#PCDATA)>
    <!ELEMENT allproperty (aproperty*)>	
  	<!ELEMENT aproperty (area+, type+, price+, visit+)> 
  	<!ELEMENT area (#PCDATA)> 
  	<!ELEMENT type (#PCDATA)>
	<!ELEMENT price (#PCDATA)>
	<!ELEMENT visit (#PCDATA)>