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As the core building blocks of the Semantic Web, ontologies provide shared vocabularies and conceptual knowledge for specific application fields. At the same time, ontologies can restrict their individuals and relationships through their semantic schema. However, logical conflicts of an ontology are often inevitably unavoidable in actual application scenarios when the ontology contains any form of disjointness or negation. Generally, logical conflicts can be divided into incoherence and inconsistency. Reasoning with incoherent ontologies may obtain many redundant relationships, and incoherence is a potential cause of inconsistency which seriously affects the correctness of semantic reasoning Therefore, handling incoherence is imperative, which mainly involves the fields of conflicts detection, ontology repair and justification computation. Various incoherent ontologies are indispensable to evaluate the proposed methods for handling incoherence. We provide a survey of relevant research works to study the proposed construction methods of incoherent ontologies. It is observed that incoherent ontologies in existing works still have the following limitations: (1) Lots of web pages used to download ontologies were temporarily constructed are now inaccessible; (2) Most of the existing incoherent ontologies were constructed in a simple way such as randomly adding disjointness axioms or merging ontologies through their alignments without considering all possible incoherence cases. To address the limitations, we propose a general framework to construct incoherent ontologies and design a hybrid algorithm to instantiate this framework. With the implemented construction methods, a comprehensive benchmark containing 116 ontologies is constructed. In our evaluations, incoherent ontologies in the benchmark are measured with 11 classic metrics. We then compare 5 representative ontology debugging systems and 3 repair methods. The evaluation results reveal that these ontologies could reflect different characteristics of each ontology system and repair method. All observations could guide researchers to select incoherent ontologies. The availability of our benchmark makes a contribution to the community of ontology debugging and repair fields. • The first work studies construction methods of incoherent ontologies. • Propose a framework of existing methods to construct incoherent ontologies. • Construct a benchmark of incoherent ontologies for ontology debugging community. • Conduct abundant experiments to compare ontology debugging systems. [ABSTRACT FROM AUTHOR]

The ontology matching is a significant task for data integration and semantic interoperability. Although a large number of effective ontology matching methods have been proposed in a fully automated way, user involvement during the matching process is needed for real-world applications. It has been recognized as an effective method for further improving the quality of matching, especially for very precise matching cases. However, involving users during complex matching process suffers from new challenges of how to reduce the burden on users and how to increase effective interaction. In this paper, we propose a novel periodic learning ontology matching model based on interactive grasshopper optimization algorithm to address the above-mentioned issues. This new model takes into account the periodic feedback from users during the optimization process, rather than every generation, and a roulette wheel method is introduced to select the most problematic candidate mappings to present to users, not all, and to reduce the burden on users. To ensure the effectiveness of the interaction, a reward and punishment mechanism is considered for candidate mappings to propagate the feedback of user, and to guide the search direction of the algorithm. The experiments, conducted on two interactive tracks from Ontology Alignment Evaluation Initiative (OAEI), show that the proposed model significantly improve the quality of matching. Compared to other state-of-the-art matching systems, our model outperforms other methods in almost all cases with given different error rate, which makes it one of the most advanced leaders. Finally, a typical case of data integration is studied to present how the proposed approach is able to help enterprises to harmonize product catalogs. [ABSTRACT FROM AUTHOR]

Ontology alignment is a fundamental task to support information sharing and reuse in heterogeneous information systems. Optimizing the combination of matchers by evolutionary algorithms to align ontology is an effective method. However, such methods have two significant shortcomings: weights need to be set manually to combine matchers, and a reference alignment is required during the optimization process. In this paper, a meta-matching approach GSOOM for automatically configuring weights and threshold using grasshopper optimization algorithm (GOA) has been proposed. In this approach, the ontology alignment problem is modeled as optimizing individual fitness of GOA. A fitness function is proposed, which includes two goals: maximizing the number of matching and the similarity score. Since it does not require an expert to provide a reference alignment, it is more suitable for real-world scenarios. To demonstrate the advantages of the approach, we conduct exhaustive experiments tasks on several standard datasets and compare its performance to other state-of-the-art methods. The experimental results illustrate that our approach is more efficiently and is significantly superior to other metaheuristic-based methods. [ABSTRACT FROM AUTHOR]