Type Alias DucBlock

Defines the "Blueprint" for a reusable component.

Element Relationship Logic: The connection between this Block Definition and _DucElementBase depends on the state:

1. Definition State (Source):

   • Elements that define the geometry of this block have this id inside their element.blockIds.
   • Their element.instanceId is null.

2. Instance State (Usage):

   • When instantiated via DucBlockInstance, the rendered elements have element.instanceId set (not null).
   • Crucially, these instance elements have empty element.blockIds.
   • The relationship is resolved indirectly: Element.instanceId -> DucBlockInstance.blockId -> DucBlock.id.