Dear Sebastian,

In fact XQuery maps are very fast, and they are a great data structure for speeding up repeated lookups if you encounter cases in which this is not done automatically by the optimizer.

If you manage to send us a little example query that demonstrates the pattern you are working on, we may be able to give some more specific help.

Best, Christian

On Wed, Aug 29, 2018 at 9:02 AM Sebastian Albert albert@math.uni-goettingen.de wrote:

Dear BaseX community

I am currently working with BaseX to write a rather long XQuery statement with quite large intermediate structures (XML documents / fragments) bound to variables (in FLWOR expressions), which I query by XPath using attributes etc. further down. Having nested loops, this is becoming very slow.

Are those intermediate structures automatically indexed? Or how can I achieve indexing on them?

Or do I need to write them into a database for this indexing? (Can I specify a datbase as "in-memory"?) Then I guess I need a "BaseX script" rather than a single XQuery? Of course, I am looking for the most elegant/idiomatic way.

Or is it best to build index-like intermediate structures myself, probably using maps rather than XML documents?

Furthermore, are there profiling tools inside BaseX, or would I need to fire up a Java IDE to see where most time is being spent?

Thanks in advance for any suggestions! Sebastian