From GridLAB-D Wiki
object - Object reference property type
Synopsis
class name { object variable; } object name { variable reference; }
Description
Object references allow a property to describe a reference to another object in the model. These are often used to access variables or functions in other objects.
Example
To declare an object reference use the syntax
class name { object variable; }
where name is the name of the class, and variable is the name of the object reference.
To define an object reference use the syntax
object name { variable reference; }
where name is the name of the class, variable is the name of the object reference, and reference is the name of the object being referred to. Object names can either be a defined name or a canonical name.