Model: Property Type

Components, entity types and relation types define which properties they contain. The so-called property types define the name, the data type and whether the property is an input or an output.

Data Model

Field	DataType	Description	Example
Name	String	The name of the property	name
Description	String	Textual description of the property	The name of something.
DataType	DataType	The data type of the property	string
SocketType	SocketType	The socket type	input
Mutability	Mutability	Defines if the property is mutable or immutable	immutable
Extensions	Vec<Extension>	The extensions contains additional information about the property type

ER Diagram

erDiagram
    Property-Type {
        string name
        string description
        enum DataType
        enum SocketType
        enum Mutability
    }
    Extension {
        string namespace
        string name
        JSON extension
    }
    Property-Type ||--}o Extension : has
    Component ||--}o Property-Type : defines
    Entity-Type ||--}o Property-Type : defines
    Relation-Type ||--}o Property-Type : defines
    Flow-Type ||--}o Property-Type : defines

Enum Data Type

A property has a data type. This is derived from serde_json::Value and maps JSON values or documents.

Value	Description
Null	Represents a JSON null value
Bool	Represents a JSON boolean
Number	Represents a JSON number, whether integer or floating point
String	Represents a JSON string
Array	Represents a JSON array.
Object	Represents a JSON object.
Any	Represents any type (relations)

The socket type determines whether a property serves as an input or an output. It is also possible that a property is neither an input nor an output. Caution: At runtime, it is not prevented if an input is used as an output or an output is used as an input.

Value	Description
None	The property doesn't act as input or output socket
Input	The property acts as input socket and accepts incoming connections
Output	The property acts as output socket and accepts outgoing connections

Enum Mutability

Defines if the property is either mutable or immutable.

Value	Description
Mutable	The property is mutable
Immutable	The property is immutable

Where is the value???

A property type only contains the definition of a property, but no data, since it is a type.

When an entity instance or a relation instance is created, the property types are used to create property instances. The property instances then contain a data stream and the last value.

Reactive Graph