Linked Open Data initiatives have made available a diversity of collections that domain experts have annotated with controlled vocabulary terms from ontologies. We identify annotation signatures of linked data that associate semantically similar concepts, where similarity is measured in terms of shared annotations and ontological relatedness. Formally, an annotation signature is a partition or clustering of the links that represent the relationships between shared annotations. A clustering algorithm named AnnSigClustering is proposed to generate annotation signatures. Evaluation results over drug and disease datasets demonstrate the effectiveness of using annotation signatures to identify patterns among entities in the same cluster of a signature.
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