Property Types & Validation

Primitive Types

Type	Stores	UI Control	Example Values
String	Short text	Text input	“FQ Vessels”, “Active”
Integer	Whole numbers	Number input	42, 0, -1
Real	Decimal numbers	Number input	3.14, 99.99
Boolean	True/false	Checkbox	true, false
Date	Calendar date	Date picker	2026-03-15
DateTime	Timestamp	DateTime picker	2026-03-15T14:30:00
UnlimitedNatural	Non-negative integer or *	Text input	0, 1, *

Enumeration Types

A property type with a fixed list of allowed values. Each value has:

• name — display label shown in UI (e.g., “Active”)
• value — machine value stored in model (e.g., “active”)

Enumeration properties render as dropdown selects in the Properties panel and catalogs.

Format Hints (String only)

Hint	Effect
multiline	Renders as a textarea instead of single-line input
url	Renders as a clickable hyperlink
email	Renders as a clickable mailto link

Format hints don’t change the stored value — it’s always a string.

Multiplicity

Value	Meaning	Behaviour
[1, 1]	Required	Must have a value; flagged by validation if empty
[0, 1]	Optional	May be empty

Default Values

Properties can define a default value at M2. When a new M1 instance is created, the property is pre-filled with this value. The default must be a valid value for the property’s data type.

For enumerations, the default is the machine value (e.g., “active”), not the display name.

Validation Rules

Rule	When checked	Behaviour
Required	On edit + integrity check	Empty required properties flagged
Type match	On edit	Invalid values rejected (e.g., text in Integer field)
Enumeration	On edit	Only defined literal values accepted
Format	On display	Format hints affect rendering, not validation