code: private XML checksAttributesExistence(Class<?> aClass,Attribute[] attributes){
  		String[] attributesNames = new String[attributes.length];
  		for (int i = attributes.length; i --> 0;) 
  			attributesNames[i] = attributes[i].getName();	
  		
  		checksAttributesExistence(aClass,attributesNames);
  		return this;
  	}
docs: Verifies that the attributes exist in aClass.
  @param aClass Class to check
  @param attributes attributes to check
  @return this instance of XML