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| Activity invocation |
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| <a name="definition"><h2>Definition</h2></a> |
| <p class="Para">An activity invocation is a step of an orchestration which invokes either an activity, i.e. a factory component or Java task.</p> |
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| <a name="motivation"><h2>Motivation</h2></a> |
| <p class="Para">An activity invocation corresponds to a delegation of work to another activity.</p> |
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| <a name="structure"><h2>Structure</h2></a> |
| <p class="Para">A factory component delegates its work to a factory component or to a Java task. This creates a graph of activity dependencies (and not a tree, because an activaty can be used by several factory components). In a production plan, this graph of activity dependencies defines the execution order to execute activity factory components and Java tasks.</p> |
| <p class="Para">A parameter of an activity invocation is linked to an activity contract. The parameter value is either the value of a factory component contract, an orchestration context, or a local value to the activity invocation.</p> |
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| <img src="./images/activityInvocationStructure.jpg" alt="Activity Invocation Structure"/> |
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| <i>Figure 1. Activity Invocation Structure</i> |
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