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dnet-hadoop/dhp-workflows/dhp-aggregation/src/site/markdown/index.md

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##DHP-Aggregation

This module defines a set of oozie workflows for

  1. the collection and transformation of metadata records.
  2. the integration of new external information in the result

Collection and Transformation

The workflows interact with the Metadata Store Manager (MdSM) to handle the logical transactions required to ensure the consistency of the read/write operations on the data as the MdSM in fact keeps track of the logical-physical mapping of each MDStore.

It defines mappings for transformation of different datasource (See mapping section).

Integration of external information in the result

The workflows create new entity in the OpenAIRE format (OAF) which aim is to enrich the result already contained in the graph. See integration section for more insight