Martin,
I'm not sure where this coded or if it is overrideable/configurable - but the jdbc/hastore__pm is the JNDI reference to the DataSource. The datasource is the pointer towards the connection pool which you can point towards Oracle, Derby (the HADB impl), Postgres, or whatever database supports the "same" SQL type calls found in the storage implementation. Actually, that's why it would be nice to have these be configurable, since they could/are different between some databases. Is that what you're asking about?
Cheers
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