The recent kml output discussion reminds me that it took me about three years of using Therion before I realized that the outputs usually do not present a consistent or unified set of representations of the cave. Since then I have been trying to make sense of it and almost came up with a tabular representation to improve on the Therion's Features wiki pages, but then got confused again. This information is already available in the Therion Book and on the wiki in various places, but I do not recall reading in one place a clear description or why it is so. Does anyone else get confused by this aspect of Therion's behaviour? Here is my first cut on an overview description of what goes on and a table that hopefully clarifies the relationships between 'export' 'selection' and 'file formats'. http://therion.speleo.sk/wiki/doku.php?id=exportselectionformat Feel free to make suggestions or edit the page to clarify further or to correct any errors in what I've presented so far. I've made a few guesses about the capabilities of many of the file formats, as I'm not familiar with all of them. Bruce