Consider the Constitution of France
http://www.thisnation.com/library/france.html
A section is devoted to the President, starting after article 4.
Article 5
The President of the Republic shall see that the Constitution is observed. He shall ensure, by his arbitration, the proper functioning of the public authorities and the continuity of the State.
He shall be the guarantor of national independence, territorial integrity and observance of treaties.
Article 7
The President of the Republic shall be elected by an absolute majority of the votes cast. If such a majority is not obtained on the first ballot, a second ballot shall take place on the second following Sunday. Only the two candidates who received the greatest number of votes in the first ballot, account being taken of any withdrawal of candidates with more votes, may stand in the second ballot.
. . . . . more in Article 7
Article 8
The President of the Republic shall appoint the Prime Minister. He shall terminate the appointment of the Prime Minister when the latter tenders the resignation of the Government.
On the proposal of the Prime Minister, he shall appoint the other members of the Government and terminate their appointments.
Article 19
Acts of the President of the Republic, other than those provided for under articles 8 (first paragraph), 11, 12, 16, 18, 54, 56 and 61, shall be countersigned by the Prime Minister and, where required, by the appropriate ministers.
Article 21
The Prime Minister shall direct the operation of the Government. He shall be responsible for national defence. He shall ensure the implementation of legislation. Subject to article 13, he shall have power to make regulations and shall make appointments to civil and military posts.
He may delegate certain of his powers to ministers.
He shall deputize, if the case arises, for the President of the Republic as chairman of the councils and committees referred to in article 15.
He may, in exceptional cases, deputize for him as chairman of a meeting of the Council of Ministers by virtue of an express delegation of powers for a specific agenda.
Article 22
Acts of the Prime Minister shall be countersigned, where required, by the ministers responsible for their implementation.
Parliment is addressed beginning with Article 24.