the branch of a country's legal system wherein legislation, custom and court
precedent combine to define the ways in which that country's nationality and
citizenship are transmitted, acquired or lost. Today, nationality law is
based either on jus soli or jus sanguinis, or on a combination of the two.
Jus soli is the principle in which a child born in a country's territorial
jurisdiction acquires that country's nationality. In jus sanguinis, either
the father or mother must normally be a citizen of the country in question
in order for the child to be a citizen.