Gorn address
A Gorn address is a method of identifying and addressing any node within a tree data structure. This notation is often used for identifying nodes in a parse tree defined by phrase structure rules.
The Gorn address is a sequence of zero or more integers conventionally separated by dots, e.g., 0 or 1.0.1.
The root which Gorn calls * can be regarded as the empty sequence.
And the -th child of the -th child has an address, counting from 0.
It is named after American computer scientist Saul Gorn.
