From this post:
Who are the Israelis?
Two governing principles formed the core of the Mandate System, being non-annexation of the territory and its administration as a “sacred trust of civilisation” to develop the territory for the benefit of its native people.
[2]
Indeed, those are the two core principles of the mandate system.
- The mandates did not annex the territories. Palestine was a state separate from the Mandate.*
- The Mandates held the territories in trust for the benefit of the people in their respective states.
*From your link:
A disagreement regarding the legal status and the portion of the annuities to be paid by the "A" mandates was settled when an Arbitrator ruled that some of the mandates contained more than one State:
The difficulty arises here how one is to regard the Asiatic countries under the British and French mandates. Iraq is a Kingdom in regard to which Great Britain has undertaken responsibilities equivalent to those of a Mandatory Power.
Under the British mandate, Palestine and Transjordan have each an entirely separate organisation. We are, therefore, in the presence of three States sufficiently separate to be considered as distinct Parties. France has received a single mandate from the Council of the League of Nations, but in the countries subject to that mandate,
one can distinguish two distinct States: Syria and the Lebanon, each State possessing its own constitution and a nationality clearly different from the other.
[28]