In a master index application, each system record and SBR in an enterprise record typically contains a set of objects that store different types of information about the business object. A record usually contains a parent object and several child objects. A record can have only one parent object, but can have multiple child objects and multiple instances of each type of child object. For example, if the business object being indexed is a person, the record can only contain one primary name and social security number, which would be contained in the parent object (for example, a person object). However, the record could have multiple addresses, telephone numbers, and aliases, which would each be defined in different child objects (for example, in address, phone, and alias objects). Each address would be stored in a different instance of an address object.