The type(expr, 'stdlib') command distinguishes user defined procedures and modules from those provided by the standard Maple library. An expression expr is of type stdlib if it is a global symbol saved in the standard repository shipped with Maple.

Currently, this type is implemented by testing for the presence of a particular attribute on the expression. This attribute is given to all top-level symbols saved in the standard repository.

The type(expr, 'std') command describes the name of a built-in procedure or an object of type stdlib. It is, by definition, equivalent to the (structured) type {builtin, stdlib}.