This example uses WebCola’s constraint-based layout to render a graph of entity, attribute, and relation nodes from a JSON dataset, with SVG rectangles and text labels colored by type. The code leverages the `cola.d3adaptor` with `symmetricDiffLinkLengths` and `start` to drive the force-directed simulation, while node dimensions adapt to label bounding boxes via `getBBox()`. Rendering is handled through D3 v4 selections, with zoom and drag interactions enabled.