Who was a "Palestinian Arab"?

Aside from the argument whether the Arabs resident in the area of historic Palestine (there was never a geopolitical country of 'Palestine') conisdered themselves as "Palestinian" or "Syrian" or "Southern Syrian", or "El-Shamites" or whether others viewed them as such, I have found a 1940 reference to the term.

Interstingly enough, it comes within the framework of the application of apartheid - whether Jews could purchase land in various Zones following the adoption of the 1939 White Paper and the 1940 Land Transfers Regulations.

Article 9 reads:

For the purposes of these regulations :-

"Palestinian Arab" shall be deemed to be an Arab who is ordinarily resident in Palestine. In case of any dispute as to whether a person is an Arab or whether he is ordinarily resident in Palestine, the question shall be referred to the High Commissioner whose decision thereon shall be final;

Residency is the defining feature of identity. Not nationality, not culture, not identification, not langauge, history or religion.

As we know, it was only in 1925 that a Palestine Nationality Law was enacted for the Mandate.

By the way, on March 6, 1940, MP Noel-Baker (Derby) moved a motion in the British Parliament: 

That this House regrets that, disregarding the expressed opinion of the Permanent Mandates Commission that the policy contained in the White Paper on Palestine was inconsistent wtih the terms of the Mandate, and without the authority of the Council of the League of Nations, His Majesty's Government have authorised the issue of regulations controlling the transfer of land which discriminate unjustly against one section of the inhabitants of Palestine...

It would seem logical that if residency was the defining term, Jews were also Palestinians, at least at that time. So, was their nationality "Palestinian"?