The set of element ids to highlight across BOTH canvases for a
selected validation result:
dataNodeId: the focus node in the data canvas.
shapeContainerId: the source shape's container in the shape canvas
(undefined when the result names no source shape).
shapeRowId: the specific property-shape row, when the result is
property-scoped (has both a source shape and a path); undefined
for node-level results, where the container is the finest target.
The set of element ids to highlight across BOTH canvases for a selected validation result: