Description of the project
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This project defines **object schemas** of the OpenAIRE main entities and the relationships that intercur among them. 
Namely it defines the model for 

- the graph internal representation, defined under the package `eu.dnetlib.dhp.schema.oaf`
- the scholexplorer content representation, defined under the package `eu.dnetlib.dhp.schema.sx`
- the contents acquired from the metadata aggregation subsystem, defined under the package `eu.dnetlib.dhp.schema.mdstore`
- the ORCID common schemas, defined under the package `eu.dnetlib.dhp.schema.orcid`
 
Te serialization of such objects (data store files) are used to pass data between workflow nodes in the processing pipeline.