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The assembly (Hierarchical Data stage)

The assembly

To configure the Hierarchical Data stage, you create an assembly.

An assembly is a series of steps that perform enrichments and transformations on hierarchical data. By default, a new assembly always contains an Input step, and an Output step. Between the Input step and the Output step, you insert additional steps that parse, compose, or transform the data from the previous step.

The Input step transforms the relational structure – the links and columns – into a hierarchical structure. In the hierarchical data structure, an input link is transformed into a list item, and each column on the link is transformed into a child content item of that list. The step Output schema displays the schema tree that represents this hierarchical data structure. This data structure is passed to the next step in the assembly, where it becomes the step Input. At each step, the step Input is modified by the action of the step. For example, if you use an Aggregate step to perform a calculation, the result of the calculation is added as a branch to the step Output. Additions to the step Output are highlighted in the schema tree.

The Output step receives the results of all of the previous step transformations. In the Output step, you map the hierarchical data structure back to a relational data structure. That is, you map schema items to output links and to the columns on those links.

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