Data Types

UML has these types:

Float

Single-precision floating-point value. Any numeric literal is a Float.

Rect

A rectangle, defined as [left, top, width, height], meaning top-left X, top-left Y, width, and height.

After definition, a Rect has read-only properties:

• Rect.l or Rect.x: left (x)
• Rect.t or Rect.y: top (y)
• Rect.w: width
• Rect.h: height
• Rect.r: right (x)
• Rect.b: bottom (y)
• Rect.cx: center x
• Rect.cy: center y

Bool

Boolean value: true or false. Currently used only in element attributes.

String

Double-quoted text. Used for button actions, colors, and URLs:

• Color: hex RGB or ARGB (e.g. "#ff0000", "#7fffffff") or name: "white", "black", "red", "blue", "yellow", "green", "gray".
• Action: button action. Values: "join" (join event), "open:url" (open URL).
• URL: web address.