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arXiv · 2107.04891

Inference of Shape Expression Schemas Typed RDF Graphs

Benoît Groz·Aurélien Lemay·Sławek Staworko·Piotr Wieczorek
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Abstract

We consider the problem of constructing a Shape Expression Schema (ShEx) that describes the structure of a given input RDF graph. We employ the framework of grammatical inference, where the objective is to find an inference algorithm that is both sound i.e., always producing a schema that validates the input RDF graph, and complete i.e., able to produce any schema, within a given class of schemas, provided that a sufficiently informative input graph is presented. We study the case where the input graph is typed i.e., every node is given with its types. We limit our attention to a practical fragment ShEx0 of Shape Expressions Schemas that has an equivalent graphical representation in the form of shape graphs. We investigate the problem of constructing a canonical representative of a given shape graph. Finally, we present a sound and complete algorithm for shape graphs thus showing that ShEx0 is learnable from typed graphs.

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Benoît Groz, Aurélien Lemay, Sławek Staworko, Piotr Wieczorek. 2021-07-10. Inference of Shape Expression Schemas Typed RDF Graphs. https://arxiv.org/abs/2107.04891

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