Hi, user-defined whatsit nodes (see sec. 8.1.4.25 in luatexref-t.pdf) are an alternative to attributes for storing information in a node list. But how does a user (package writer) tell between his user-defined whatsit nodes and third party user-defined whatsit nodes? Is there a way to allocate at run-time a unique identifier to mark nodes, similar to the attribute allocation mechanism provided by package luatexbase?
Best regards, Stephan Hennig
