Property Data Types

When you add a property to a Node Type or Relationship Type, you pick a Type that decides what kind of value its instances can hold and how the value is edited.

Select a type in the Model Navigator, open the Property Definitions section in the Properties panel, and click + Add. Each property row has a Name, a Type dropdown, a Req (required) checkbox, an f(x) (formula) checkbox, and a Default.

The nine data types

Type	Holds	Edited as	Use it for
String	A single line of text	Text field	Names, codes, short labels
Number	A numeric value	Number field	Counts, prices, durations
Boolean	True or false	Checkbox	Flags like "active", "critical"
Date	A calendar date	Date picker	Deadlines, start dates
Option	One choice from a fixed list	Dropdown	Status, priority, category
Asset	A reference to a file in your model	Asset picker	Attached diagrams, documents, datasets
JSON	Structured JSON data	Validated text field	Raw configuration, payloads
Rich Text	Formatted (Markdown) text	Multi-line editor	Long notes rendered with headings and lists
Dictionary	A set of key-value pairs	Key-value editor	Labels, tags, free-form attributes

Setting choices for an Option property

When you choose Option, enter the allowed choices in the Default field as a comma-separated list, for example:

Low,Medium,High

Instances of the type then show a dropdown limited to those choices.

Default values

For most types, whatever you type in the Default field is pre-filled on every new instance. You can override it on any individual node or relationship.

Required properties

Tick the Req checkbox to mark a property as required. This signals to your team (and the AI assistant) that the value should always be filled in.

Computed properties (f(x))

Tick the f(x) checkbox to make a property computed. Instead of a fixed value, the Default field becomes a formula that calculates the value automatically — used by the simulation layer to derive values each timestep. A computed property is shown read-only in tables. (See the Rhai scripting help for how to write formulas.)

Good to know

Property types apply equally to Node Types and Relationship Types.
A property defined on a type appears on all instances of that type.
Renaming a property on the type updates it everywhere — the underlying value is kept.

Property Data Types