Summary: | Data integration is the task of providing a unified view of multiple data sources. Thesesources can be, and are typically, heterogeneous in their data model, data query language (DQL), and data manipulation language (DML). In this thesis is described a system called”Listen Online”, or Lion for short. Lion utilizes the GraphQL specification to provide integration for querying of web services. Lion provides a general structure by which arbitrary mediators can be used within a query. Lastly, by building on top of open source libraries,Lion provides the open source community with components that enable it to function in the form of GraphQL servers, visual layout libraries, and query builders.
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