System Architecture
Le Select is based on a distributed computing system and has a fully distributed architecture. There is no Le Select global repository and no global schema. When data is published on Le Select it is viewed by users as tuples in a relational table, regardless of the native data format which could be a flat file or a spreadsheet. Wrappers are software modules used by Le Select to translate data from native format into the relational format that is viewed by users. They also contain information about how to locate data on a server and how to access it and are formed by a set of Java Classes with additional XML definition files. They are designed so that wrappers that serve similar purposes can be re-written, rather than a developer having to start from scratch.
Because Le Select is based on a fully distributed system architecture, a program can run on one Le Select server whilst using data from another server. The system sends the data to the server where the program is running, coordinates its execution and sends back the results to the client as relational table.
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