Paper-summary posters previously required hand-written XML: every engine
box rendered identically (white, 11px), so anything whose meaning lives
in visual hierarchy came out flat. This makes presentation a first-class,
generalised part of the declaration - not a poster feature.
Structure/presentation separation, the same split HTML and CSS settled on:
- ROLE says what a node IS: banner, heading, body, callout, good, bad,
metric, muted. Maps to a type scale and an emphasis (filled / tinted /
outlined / ghost), never to a colour.
- GROUP says which semantic zone a node belongs to. Each distinct group
name gets one hue ramp (tint / base / dark), assigned in document
order. Promoted from a draw_graph-only field to BoxNode and GroupNode,
round-tripped via dai_group.
- themedStyle(role, hue, kind) composes the two by rule - there is no
per-combination table to extend, so a new diagram kind gets full
theming by tagging nodes. The model never sees a hex value.
A heading container plus a group yields the tinted section panel with a
dark title; a grouped body box takes its zone's tint; verdict roles stay
green/red regardless of zone; the banner is the page's one dark field.
Also fixed, found while building the acceptance poster:
- autoBoxSize only counted explicit newlines, so a long single-line label
wrapped to six lines in draw.io but got a one-line-tall box, and the
text overflowed the cell.
- Marker stamping appended without replacing, so every render of a
recovered style grew it by one duplicate dai_* token per key -
unnoticed because draw.io resolves duplicates last-wins. dai_* keys
are now replaced in place; mxGraph keys still append, because
last-wins is load-bearing for container=1 normalisation.
- Banner/heading/metric roles stretch across their container's cross
axis, the way a masthead spans its page.
- Prompt: a poster's banner IS its title (no set_title alongside), and
sections get their colour by naming groups.
537 unit tests, 250-flowchart corpus still zero crossing arrows, 5 e2e
tests in a real browser. Verified visually: the Transformer-paper poster
renders with a navy masthead, three hue-coded section panels, metric,
verdict and callout boxes - all engine-computed geometry.
