Presentation on sept 21, 2013 at FOSS4G 2013 in Nottingham (UK). Stetl, Streaming ETL, is a lightweight, geospatial ETL-framework written in Python, integrating transformation tools like GDAL/OGR, XSLT and PostGIS. Stetl targets ETL cases that involve XML and GML data, like INSPIRE data harmonization, but other transformations, even non-geospatial, can also be made. Stetl applies declarative programming: a configuration file specifies an ETL chain of input/filter/output modules. Stetl uses native calls to C-level libraries like libxml2 (via lxml) for speed. See more at http://stetl.org Watch this presentation video recording on FOSSLC: http://www.fosslc.org/drupal/content/taming-rich-gml-stetl-lightweight-python-framework-geospatial-etl