GLUE System Architecture. There are four modules are included in the GLUE system. The Distribution Estimator module uses multiple machine learning strategies to generate a join probability distribution P(A, B). The Similarity Estimator module uses the Jaccard Similarity function to construct a similarity matrix. The Relaxation Labeler module uses domain constraints and heuristic knowledge to improve the match accuracy. Finally, after validation by experts, the Translator module encodes the mapping paths with uniform RDF format and loads them into GORouter.