Dalia;  These seem like separate issues to me so I'm creating a new
post for this one.

Composer is an RDF/RDFS/OWL-based editor - i.e. Semantic Web data
using RDF triples.  Relational databases store data in relational
form, a different data structure than triples in RDF.  To view
relational data in RDF, you need to create a mapping that states how
Composer (in general an RDF/OWL editor) will interpret the relational
data as RDF triples.

In addition to relational data formats, Oracle 11g can store RDF data
directly - i.e. in RDF triples instead of relational data.  This
requires some setup supplied by Oracle.  The 'New… RDF/OWL Oracle
Database' refers to this RDF data store.  There is more on this in
  Help  > Advanced Topics > Working with RDF Databases > Oracle 10g/
11g RDF Databases (*.oracle)

If you have Oracle data in a "traditional" relational format, Composer
supports wizard that generates the mappings for you.  This is in
'Import… RDF/OWL View on Relational Database via D2RQ'.  Name the base
URIs for the mapping, schema, and data files as desired, enter
information to log into the relational data store and the wizard will
generate a mapping for you to view the data.  More can be found in:
  Help > Import and Export > Import external information > Importing
Relational Databases with D2RQ

-- Scott

> An existing Oracle RDF data store?  Or did you create a new one?  How?
> Or are you referring to a relational store?
>        It's a relational store. I need to make it a rdf store to look at the 
> instance in TBC. I tried to link them using > new - Oracle database

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