How to Define the Concept of the Personal Property

What is can be called the and what is can be called the thing of the real property law? The answers to the question will directly affect the definition of the personal property. The definition of the should be based on the objective existence of the object, and the definition of the treated should be characteristic of its subjective existence of the object. Based on of those, it can define the concept of the personal property in two ways: one is the subtraction principle, means that the personal property is something residual after the extension of the concept detracting the real property; another is the imitation principle, means that the personal property still including the treated of the real property law.