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| Orchestration |
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| <a name="definition"><h2>Definition</h2></a> |
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| <p class="Para">An orchestration definies how to conduct a set of activities and how activities transform data.</p> |
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| <a name="motivation"><h2>Motivation</h2></a> |
| <p class="Para">An orchestration is the logic to achieve a generation target. However, an orchestration is also a data workflow. Input data can be injected at different stages; an activity output is potentially an input of a next activity.</p> |
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| <a name="structure"><h2>Structure</h2></a> |
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| <p class="Para">An orchestration works with a data context, a set of activities, and a workflow which defines how to conduct the activities. A workflow conforms to a language (e.g., BPMN).</p> |
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| <img src="./images/orchestrationStructure.jpg" alt="Orchestration structure"/> |
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| <i>Figure 1. Orchestra structure</i> |
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