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}.

$\mathrm{type}\left(\sin \,'\mathrm{stdlib}'\right)$

$\mathrm{true}$

$\mathrm{type}\left(\sin \,'\mathrm{std}'\right)$

$\mathrm{true}$

$\mathrm{type}\left(\mathrm{op}\,'\mathrm{std}'\right)$

$\mathrm{true}$

$\mathrm{type}\left(\mathrm{op}\,'\mathrm{stdlib}'\right)$

$\mathrm{false}$

$\mathrm{type}\left(2\,'\mathrm{stdlib}'\right)$

$\mathrm{false}$

$\mathrm{type}\left(\mathrm{Units}\,'\mathrm{stdlib}'\right)$

$\mathrm{true}$

$f≔s\mapsto \frac{\sin \left(s\right)}{\cos \left(s\right)}\:$

$\mathrm{type}\left(f\,'\mathrm{stdlib}'\right)$

$\mathrm{false}$

$\mathrm{select}\left(\mathrm{type}\,\left\{\mathrm{anames}\left('\mathrm{procedure}'\right)\right\}\mathbf{minus}\left\{\mathrm{anames}\left('\mathrm{environment}'\right)\right\}\,'\mathrm{Not}\left(\mathrm{std}\right)'\right)$

$\left\{\mathrm{anames}\,f\,\mathrm{print}\,\mathrm{streamcall}\right\}$