Property-graph schema

Nodes and edges with properties: the schema of a property graph, including which labels and properties exist.

ddn@1New DDN source

Open viewer Open designer Run verifier Download DDN

Why use it?

Graph stores still need contracts — "schemaless" without a written agreement becomes archaeology.

When it helps

Designing or reviewing a property-graph model (nodes, edge types, properties).

How to read it

Node labels are types; edge labels are typed relationships.
Properties attach to the node or edge that owns them.

What you need

Node labels
Edge types and their directions
Property sets per label

Things to check

Do not model every relationship as a generic "related" edge.
Do not store on an edge what belongs to the node.

Scope of this diagram

Declared schema only; no graph query execution.

Work with the converted example

Open the viewer and select diagram. 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.