BaseXdb/basex — pull request #653 by LeoWoerteler (2013-03-07 13:17:00+00:00)
Title: Restructured Variable Handling & General FLWOR Features

Some of the changes:

* Variables are written to and read from statically determined stack frames.
* Implemented `allowing empty`, `window`, `count` and fixed bugs in `group by` and `order by`.
* More rigorous optimizations.
* Various refactorings.