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During the 1970s and 1980s , the business of constructing highways became far more politicized . Matching is one of the key operations for enabling the Semantic Web since it takes two schemas / ontologies , each consisting of a set of discrete entities ( e.g ., tables , XML elements , classes , properties , rules , predicates ) , as input and determines as output the relationships ( e.g ., equivalence , subsumption ) holding between those entities . " To improve the average performers ' skills , the consultants broke the team into small groups and gave them two hours of training a week for eight weeks . It shows the general patterns of a HyTropes page : a strip accessing super-entities , the identification of the current entity , an embedded description of it , its description from the Tropes content which includes links to other entities , a set of buttons triggering Tropes functionalities , another embedded HTML description and the HyTropes footer . In order to help initiate practice , two Web pages were provided - - one containing academic resource information addresses , the other containing guidelines for bibliography searches . Once armed with the basic skills , the DT members , beginning in the summer of 1995 and continuing through and beyond 1996 , started to train new users of the network .