Newbie to OAI-ORE

[Paulo Graça]

Hi there,

I'm a newbie to OAI-ORE model and first of all, I would like to thank you for your attention to my dumb questions.

I've started on an ongoing project and I stand across with the model.
But when I learned a little more about OAI-ORE, there where some things that didn't make some sense to me. One of those things it's our upload communication model that uses OAI-ORE.

About our project: This project was built to gather and store epidemiological data. We store epidemiological resources. We are using OAI-ORE model to describe  aggregations of resources for the upload process.

This is our upload model example, in our online documentation:

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:dcterms="http://purl.org/dc/terms/" xmlns:ore="http://www.openarchives.org/ore/terms/" xmlns:foaf="http://xmlns.com/foaf/0.1/">   
  <rdf:Description rdf:about="file://rdf.xml">
    <!--The Resource ORE is an Aggregation-->
    <rdf:type rdf:resource="http://www.openarchives.org/ore/terms/ResourceMap"/>
    <!--The Resource Map describes a specific Aggregation-->
    <ore:describes rdf:resource="empid:1"/>
    <!--Metadata about the Resource Map: datetimes, rights, and author-->
    <dcterms:creator>Epidemic Marketplace Mediator</dcterms:creator>
    <dcterms:created rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2010-09-28T18:30:02Z</dcterms:created> <!-- The date it was created --> 
  </rdf:Description>


  <rdf:Description rdf:about="empid:1"> <!--The Resource ORE is an Aggregation, This describes what is being added to the default collection empid:1-->
    <rdf:type rdf:resource="http://www.openarchives.org/ore/terms/Aggregation"/>
    <!-- EM metadata -->
    <em:em xmlns:em="http://epiwork.di.fc.ul.pt/metadata/">
      <em:title>Epidemic Marketplace Types</em:title>
      <em:subject>Meta-Information</em:subject>

(...)

      </em:rights>
    </em:em>
  </rdf:Description>
</rdf:RDF>


First question: Do we really need this 2 Descriptions? Would it be correct to use just one, some blank node type - using the rdf:nodeID - rdf:nodeID="empid:1"?

Thanks in advance!