ApproxMap - a method for mapping blank nodes in RDF datasets

Background Versioning has proven to be essential in areas like software development or data and knowledge management. For systems or applications making use of documents formatted according to the Resource Description Framework (RDF) standard, it is difficult to calculate the difference between two versions, owing to the presence of blank nodes, also known as bnodes in RDF graphs. These are anonymous nodes that can assume different identifiers between versions. In this case, the challenge lies in finding a mapping between the sets of blank nodes in the two versions while minimizing the operations needed to convert one version into another.