Abstract
The question whether an ontology can safely be replaced by another, possibly simpler, one is fundamental for many ontology engineering and maintenance tasks. It underpins, for example, ontology versioning, ontology modularization, forgetting, and knowledge exchange. What ‘safe replacement’ means depends on the intended application of the ontology. If, for example, it is used to query data, then the answers to any relevant ontology-mediated query should be the same over any relevant data set; if, in contrast, the ontology is used for conceptual reasoning, then the entailed subsumptions between concept expressions should coincide. This gives rise to different notions of ontology inseparability such as query inseparability and concept inseparability, which generalize corresponding notions of conservative extensions. In this chapter, we survey results on various notions of inseparability in the context of description logic ontologies, discussing their applications, useful model-theoretic characterizations, algorithms for determining whether two ontologies are inseparable (and, sometimes, for computing the difference between them if they are not), and the computational complexity of this problem.
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Notes
- 1.
- 2.
For DLs that admit role inclusions, one additionally considers entailment of these.
- 3.
An alternative elementary proof is given in [52].
- 4.
This should not be confused with the size of uniform interpolants, which can even be triple exponential in \(\mathcal{EL}\) [54].
- 5.
- 6.
In fact, when we say ‘Horn DL’, we mean a DL in which every KB has a universal model.
- 7.
\(\mathcal {I} _2'\) is a subinterpretation of \(\mathcal {I} _2\) if \(\varDelta ^{\smash {\mathcal {I} '_2}} \subseteq \varDelta ^{\smash {\mathcal {I} _2}}\), \(A^{\smash {\mathcal {I} '_2}} = A^{\smash {\mathcal {I} _2}} \cap \varDelta ^{\smash {\mathcal {I} '_2}}\) and \(r^{\smash {\mathcal {I} '_2}} = r^{\smash {\mathcal {I} _2}} \cap (\varDelta ^{\smash {\mathcal {I} '_2}} \times \varDelta ^{\smash {\mathcal {I} '_2}})\), for all concept names A and role names r.
- 8.
Robustness under replacement can be defined for KBs as well and is equally important in that case. In this short discussion, however, we only consider TBox inseparability.
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Acknowledgments
Elena Botoeva was supported by EU IP project Optique, grant n. FP7-318338. Carsten Lutz was supported by ERC grant 647289. Boris Konev, Frank Wolter and Michael Zakharyaschev were supported by the UK EPSRC grants EP/M012646, EP/M012670, EP/H043594, and EP/H05099X.
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Botoeva, E., Konev, B., Lutz, C., Ryzhikov, V., Wolter, F., Zakharyaschev, M. (2017). Inseparability and Conservative Extensions of Description Logic Ontologies: A Survey. In: Pan, J., et al. Reasoning Web: Logical Foundation of Knowledge Graph Construction and Query Answering. Reasoning Web 2016. Lecture Notes in Computer Science(), vol 9885. Springer, Cham. https://doi.org/10.1007/978-3-319-49493-7_2
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