Stylistic peculiarities of the style of official documents in english

style of speech.
The style of official documents is represented by the following sub-styles, or varieties:
the language of business documents
the language of legal documents
the language of diplomacy
the language of military documents

a society and its members (statute or ordinance); c) two or more enterprises or bodies (business correspondence or contracts);  d) two or more governments (pacts, treaties);  e) a person in authority and a subordinate (orders, regulations, authoritative directions);  f) the board or presidium and the assembly or general meeting (procedures acts, minutes), etc.

Types of official documents:

reach agreement between two contracting parties.

expressions:
I beg to inform you;
I beg to move;
I second the motion;
provisional agenda;
the above-mentioned;
hereinafter named;
on behalf of;
private advisory;
Dear sir.

(Member of Parliament); Gvt. (government); H.M.S. (Her Majesty’s Steamship); $(dollar); Ltd (Limited).
DAO (Divisional Ammunition Officer); adv. (advance); atk. (attack); obj. (object); A/T (anti-tank); ATAS (Air Transport Auxiliary Service).

like extra revenue; taxable capacities; liability to profit tax.
Terms and phrases like high contracting parties; to ratify an agreement; memorandum; pact; protectorate; extra-territorial status; plenipotentiary will immediately brand the utterance as diplomatic.
In legal language, examples are: to deal with a case; summary procedure; a body of judges; as laid down in; the succeeding clauses of agreement; to reaffirm faith in fundamental principles; to establish the required conditions; the obligations arising from treaties and other sources of international law.

cooperate (=to work together); to promote (=to help something develop); to secure (=to make certain) social progress; with the following objectives/ends (=for these purposes); to be determined/resolved (=to wish); to endeavour (=to try); to proceed (=to go); inquire (to ask).