Standards families
SysML internal block diagram
Inside one block: its parts wired through ports, connectors carrying the declared item flows.
sysml.ibd@2New DDN source
Why use it?
The IBD is where interface mismatches are found on paper — every connector crosses a port that must type-check.
When it helps
Detailing how the parts of one assembly connect and what flows between them.
How to read it
- The frame is the enclosing block; rectangles inside are parts named role:Type.
- Small squares on part borders are ports; connectors between ports carry items.
What you need
- The enclosing block
- Its parts (from the BDD)
- Ports and connectors
Things to check
- Do not connect parts without ports once ports are declared — the hidden interface is the bug.
- A connector carrying an item the port cannot convey is a defect, not documentation.
Scope of this diagram
Declared connectivity with port compatibility validation; physical routing is not modelled.
Work with the converted example
- Open the viewer and select
ibd. Inspect the rendered view and its source. - Open the designer. Keep the selected profile and inspect its legal palette and property controls.
- Change one displayed title or an appropriate data value. Apply the edit and check the resulting diagram.
- Run the verifier and review its diagnostics before moving complete content into review.
- Download your edited DDN source to retain the change.
The example uses the indentation-based ddn-next-1 dialect. The language guide explains reusable definitions, dotted data rows and explicit property blocks.