# Indexed grammar

> generalization of context-free grammars in that nonterminals are equipped with lists of flags, or index symbols

**Wikidata**: [Q6590011](https://www.wikidata.org/wiki/Q6590011)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Indexed_grammar)  
**Source**: https://4ort.xyz/entity/indexed-grammar


## References

1. Freebase Data Dumps. 2013
2. [OpenAlex](https://docs.openalex.org/download-snapshot/snapshot-data-format)