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====== Production operators ======

Production operators are operators that can be used in a production statement.
===== Edge operators =====

| whitespace | add node and connect with previous node, if any, by a successor edge |
| > | connect node with previous by a successor edge |
| < | connect node with previous by a reverse successor edge |
| %%<->%% | connect node with previous by successor edges in both directions |
| %%---%% | connect node with previous by a successor edge if there does not yet exist such an edge in either direction |
| %%+>%%, %%<+%%, %%<+>%%, %%-+-%% | as before, but branch instead of successor edges |
| %%/>%%, %%</%%, %%</>%%, %%-/-%% | as before, but refinement instead of successor edges |
| %%-e->%%, %%<-e-%%, %%<-e->%%, %%-e-%% with an int-valued expression e | as before, but edges of type e instead of successor edges |
| %%-n->%% with a node-valued expression n | create a compound edge with n encoding the edge data |
| %%<-n-%% with a node-valued expression n | as before, but reverse direction |
| [, ] | define the starts and the end of a branch connected subgraph |