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A tree is a special type of graph which only allows for a hierarchical set of edges similar to a tree . Mathematically it is actually an arborescence. Trees have a root node and children nodes. In formal terms it is described as an acyclic connected graph.

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Chomsky hierarchy for tree structures

In particular, this hierarchy should include tree automata, perhaps streaming tree automata, the algorithms used to apply CSS rules... …
Bruno Le Floch's user avatar