@startuml
skinparam class {
	BackgroundColor White
	ArrowColor Black
	BorderColor Black
}
class Entity
class Person
class Organization
class Property
class Activity
class Document
class Student
class Teacher
class Assign
class Perform
class Check
class Computer
class Pencil
Entity <|-- Person
Entity <|-- Organization
Entity <|-- Property
Entity <|-- Activity
Entity <|-- Document
Person <|-- Student
Person <|-- Teacher
Activity <|-- Assign
Activity <|-- Perform
Activity <|-- Check
Property <|-- Computer
Property <|-- Pencil
hide members
hide circle
hide methods
@enduml