| http://www.w3.org/ns/prov#value | - A future project we have in mind is to combine the mathemat-ical layout techniques of dot with an interactive front-end that allows user-de???nedhints and constraints.3 Advanced Features3.1 Node PortsA node port is a point where edges can attach to a node. (When an edge is notattached to a port, it is aimed at the node???s center and the edge is clipped at thenode???s boundary.) Simple ports can b
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