code: public static int getScopeId(String scope) throws JspTagException {
  		if(scope==null || PAGE.equals(scope)) return PageContext.PAGE_SCOPE;
  		else if(REQUEST.equals(scope)) return PageContext.REQUEST_SCOPE;
  		else if(SESSION.equals(scope)) return PageContext.SESSION_SCOPE;
  		else if(APPLICATION.equals(scope)) return PageContext.APPLICATION_SCOPE;
  		else throw new LocalizedJspTagException(ApplicationResources.accessor, "Scope.scope.invalid", scope);
  	}
docs: Gets the PageContext scope value for the textual scope name.
  
  @exception  JspTagException  if invalid scope