The require-any dependency is used if more than one package can satisfy a functional requirement. IPS chooses one of the packages to install if the dependency is not already satisfied.
For example, you could use a require-any dependency to ensure that at least one version of Perl is installed on the system. The versioning is handled in the same manner as for the require dependency.
An example require-any dependency is:
depend type=require-any fmri=pkg:/editor/gnu-emacs/gnu-emacs-gtk \
fmri=pkg:/editor/gnu-emacs/gnu-emacs-no-x11 \
fmri=pkg:/editor/gnu-emacs/gnu-emacs-x11