Sabrish Subramanian wrote:
> hi ,
>
> how does the expression retrieves the data from the database ? and where
> does this happen. i cant figure out the exact file but i guess the
> expression.evaluate () itself does this. is this true ? but the link to the
> db.js is misssing....
>
Expressions are parsed in
http://simile.mit.edu/repository/exhibit/trunk/src/webapp/api/scripts/data/expression-parser.js
and constructed into objects implemented in
http://simile.mit.edu/repository/exhibit/trunk/src/webapp/api/scripts/data/expression.js
These objects have evaluate* methods that retrieve the data from the
database.
There is no db.js. There is database.js.
http://simile.mit.edu/repository/exhibit/trunk/src/webapp/api/scripts/data/database.js
The database is a graph-based database. It stores triples of
subject --predicate--> object
The expression language provides an abstraction on top of that graph
model. The graph model is briefly described here
http://simile.mit.edu/wiki/Exhibit/Understanding_Exhibit_Database
Hope that helps,
David
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