Demo: a sectioned pump diagram
The canonical sectioned diagram (Example 2 of the diagrams design): a pump node carved into three flex sections — a fixed-percent header, a weighted middle split into a rebound motor section and a detail section, and a fixed-absolute footer holding two ports — wired to a valve node by a port-to-node edge. One position is pinned with !; every other visual line is machine-materialized cache.
The scene, aesthetics, and asserted facts all materialize into this document's canonical RDF graph — see the sdd namespace for the vocabulary.