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For example, the Get shipment details tasks may be performed by a human actor, who receives the package to be sent from the sender and tracks respective data via the CRM system; the Calculate route task could instead be performed automatically by the shipment planning application. Given such a model, a WfMS is able to parse the model and derive coordination actions from it, which it can execute automatically, thereby coordinating the progress of the process from start to end. As also illustrated in Fig.

In LAV, entities in the original sources are mapped to the mediated schema. This means that the mediated schema is designed independently of the actual sources and, instead of specifying how to 22 Fig. 3 Example of GAV and LAV schema mappings for the integrated order DB. (a) GAV mapping for the global relation BILLING. The global relation is defined as a view on the local source relations. (b) LAV mapping for Source2 and Source3. The local source relations are defined as views over the global relations 2 Data and Application Integration a b compute tuples of the mediated schema like in GAV, each data source is described as a view over the mediated schema.

The global schema in particular consists of two relations, SHIPMENT and BILLING, the first one collecting data needed for the shipment planning, the second one collecting data needed for billing purposes. The contents of these two relations are provided by three data sources that store order data, for example, collected through a Web application, CRM customer data, and data about specific pricing conditions. We will see in the following how, according to different mapping methods, queries posed to the virtual integrated system are reformulated into queries to the actual data sources.

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Advanced algorithms by Khuller S.


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