Issue 2: Composites -- BUT ...
Issue 2: Composites -- BUT ...
Why limit ourselves to augmenting the node/link model?
There are alternative data models for explicitly representing the relationships among "nodes"
Petri Nets in Trellis: Stotts & Furuta, HT89, TOIS89Sets: Parunak, HT91Relations in Aquanet: Marshall et al., HT91