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arXiv · 2601.03896

Parsing Hypergraphs using Context-Free Positional Grammars

Gennaro Costagliola·Federico Vastarini
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Abstract

We present a novel work-in-progress approach to the parsing of hypergraphs generated by context-free hyperedge replacement grammars. This method is based on a new LR parsing technique for positional grammars, which is also under active development. Central to our approach is a reduction from hyperedge replacement to positional grammars with additional structural constraints, enabling the use of permutation-based operations to determine the correct ordering of hyperedges on the right-hand side of productions. Preliminary results also reveal a distinction between ambiguity in graph generation and ambiguity in graph recognition. While the exact class of hyperedge replacement languages parsable under this method remains under investigation, the approach provides a promising foundation for future generalisations to more expressive grammar formalisms. Graph parsing remains a broadly relevant problem across numerous domains, and our contribution aims to advance both the theoretical and practical understanding of this challenge.

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Gennaro Costagliola, Federico Vastarini. 2026-01-07. Parsing Hypergraphs using Context-Free Positional Grammars. https://doi.org/10.4204/eptcs.440.1

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