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##DHP-Aggregation
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This module defines a set of oozie workflows for
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1. the **collection** and **transformation** of metadata records.
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2. the **integration** of new external information in the result
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### Collection and Transformation
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The workflows interact with the Metadata Store Manager (MdSM) to handle the logical transactions required to ensure
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the consistency of the read/write operations on the data as the MdSM in fact keeps track of the logical-physical mapping
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of each MDStore.
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It defines [mappings](mappings.md) for transformation of different datasource (See mapping section).
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### Integration of external information in the result
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The workflows create new entity in the OpenAIRE format (OAF) whose aim is to enrich the result already contained in the graph.
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See integration section for more insight
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