A node type to mark long distance dependencies of syntactic movement:

(-NONE- nodes)

In the Penn Treebank project, traces are used to co-index tokens for the dependencies between them.


University of Michigan - Ann Arbor

The project involves building treebanks from the Brown, Switchboard, ATIS, and Wall Street Journal corpora of English, as well as treebanks in Arabic and Chinese

The Penn Treebank project

An on-going but a helpful book resource about NLP
https://web.stanford.edu/~jurafsky/slp3/

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