What is the literary devices used in the poem Borneo's Green Heart?

Borneo's Green Heart

A gem of a nation

An abode of peace

A treasure of empire

A haven of tranquility

A kingdom of treasures

An oasis of modern empire

A space of warmth greeting

A den of hospitable people

A neoclassical form of politics

A gateway to beyond comports

An avenue of understanding

An environment of treasures

An ancient Sultanate kingdom

An indeed pampering Brunei