是一个经济学管理应用软件 很难找的 但是经济学学生又必须用到

				/*                                  null
				
					Null class, typically used to create instances with all dynamic
					attributes.
				*/
				*! version 1.0.0  30jul2002
				
				version 8
				
				class {
				} , inherit(object)
				
				/* -------------------------------------------------------------------------*/
				/*
					Usage:  .nameof dyn_dex
				
					Returns the name of the dynamically declared attribute at index
					dyn_dex.
				*/
				
				program define nameof
				
					_cls nameoflocal .dynamicmv[`1']
					class exit `"`r(name)'"'
				end