[VuFind-General] How is search working / Why both data folder and solr db?

[Ludwig Z. <lud...@go...>]

Hello,

Since the sourceforge search is timing out right now, I am posting this 
question without knowing, if it was discussed already.

I am curious, why there is a data folder, even though actually 
everything from catalog.xml is posted to solr in import-solr.php. When 
is the data folder used?

If the question has not been placed here so far, a more complete answer 
might be valuable for this list.

Thank you once more,
Ludwig