Model: Component

A component is a reusable building block for entity types and relation types. A component semantically represents an aspect of one or more entity types or relation types.

For example, the component "named" represents that something has a name. In practice, the component has a property called "name" which contains the name. The "named" component can be used in a wide variety of cases. For example, a player has a name, a server has a name, and a player model also has a name. Apart from the name, they have little in common.

A component should provide at least one property. However, it is also possible to define several properties.

Another example is the "position" component, which defines the x, y, and z coordinates. Again, this is a perfect example of a Component. Because all things in a 3D world have a position. A player has a position, a camera, a flag or a light each have a position. But here, too, they have little in common. And yet they have at least one thing in common.

A player has a name and a position, i.e. an entity type (just like a relation type) can consist of several components. The properties of all components are merged.

Data Model

ER Diagram

erDiagram
    Component {
        string name
        string description
    }
    Property-Type {
        string name
        string description
    }
    Extension {
        string name
        JSON extension
    }
    Component ||--}o Property-Type : defines
    Property-Type ||--}o Extension : has
    Entity-Type o{--}o Component : composes
    Relation-Type o{--}o Component : composes

GraphQL