Lookups the filter and the canvas share, built once per payload — id-space bookkeeping only; names, canonical tag spelling and degree ride on the payload.
Paper node id -> the author/tag node ids it is joined to.
Author or tag node id -> the paper node ids joined to it.
Node id -> its type, for edge endpoints and style passes.
Lookups the filter and the canvas share, built once per payload — id-space bookkeeping only; names, canonical tag spelling and degree ride on the payload.