code: public XML deleteClass(Class<?> aClass){
  		boolean isRemoved = xmlJmapper.classes.remove(new XmlClass(aClass.getName()));
  		if(!isRemoved)Error.xmlClassInexistent(this.xmlPath,aClass);
  		return this;
  	}
docs: This method remove a specific Class from Xml Configuration File
  @param aClass class to delete
  @return this instance of XML