Let us go on now to tell of a large city which forms part of the province of Aden but has a petty ruler of its own. This city, which lies about 400 miles north-west of the port of Aden, is called Shihr. It is ruled by a count, who maintains strict justice in his domain. He has several cities and towns under his sway but is himself subject to the sultan of Aden. The people are Saracens and worship Mahomet. The city has a very good port; for I assure you that many merchant-ships come here well loaded with goods from India, and from here they export many goods to India. In particular, they export innumerable fine chargers and sturdy pack-horses of great worth and price, on which the merchants make a handsome profit.
What are most likely the author's purposes for writing this text?

To explain the principle of Federation and autonomy

Explanation:

Though Shihr is under Aden,yet still the count is regarded as a ruler who maintains order in his domain but still responsible to the sultan of Aden

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this statement is true.

forests are public goods, available for everybody. when usage of such a good becomes interesting for consumers and its usage increases, there can be a risk of overexploitation. it is a non rival good therefore, if one person consumes the good it does not reduce the availability for subsequent consumers.

these caracteristics require the establishment of measures in order to prevent the destruction of a commonly owned space, for example, to restrict the amount of people that have access to the same time.