On 4/07/2019 19:43, Sanjeev Devireddy wrote:
Hi Holger,
Thanks for your response. Your post answers some of my questions.
Please check my other comments/queries below.
Hi Sanjeev,
I assume this is about TopBraid's relational database storage, aka
SDB.
Yes, this is about our TopBraid EDG application instance's
relational database storage and it is MySQL.
This stores RDF triples, and RDF triples can only store literals
(e.g. strings) in the object position. So if SDB stores literals
in a column called lex then this is indeed the only place where
user IDs are stored.
So, my understanding is that if all the literals that are at the
Object position of Triples are stored in the column called lex then
the user IDs are also stored in that same column.
Yes.
However, note that users can sometimes be stored as part of URIs,
of the form urn:x-tb-users:XY where XY is the user ID, and those
may be used in either subject or object position, and therefore be
stored in corresponding RDB database columns.
Does it mean to say that if an user ID (stored as part of URIs,
of the form urn:x-tb-users:XY where XY is the user ID) is at the
Subject position of a Triple then that user ID is stored in a
different RDB database column other than the column named lex, which
contains literals that are at the Object position of Triples?
There are only few triples of that form, that have the user URI in the
subject position. They would be triples that attach some (meta) data to
the user resources themselves. But yes, if these triples occur then they
would be in a different column, for the subject position of triples.
Holger
I am not sure if this answers your question.
Holger
Thanks,
Sanjeev
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