Whereas caste membership is commonly connected with the practice of an occupation
Whereas caste membership is commonly connected with the practice of an occupation, such as agriculture, or commerce, or war, there can be, of course, caste members who are not engaged in caste work and individuals who do certain forms of work who are not members of that caste commonly associated with such work.
Caste, commonly, though not invariably, is a matter of birth.
One may, too, be received into a caste by investment.
Normally mating takes place among caste members, but if the mating is of mixed caste, the woman may elect to retain caste, which is commonly done, or be received into the caste of the male companion. Caste membership of the children born of such a union is a function of the caste of the father. Similar considerations, in certain cities, hold of citizenship.
Slave Girl of Gor, p.359