Double step selecting may feel odd with the standard installation but there is 
one plugin utilising the double step format-file name selection. Deejump plugin 
adds another shapefile adapter and one more GML reader.  By the way, it can 
open GML2 files coming from WFS 1.0.0 service or created by ogr2ogr without 
OpenJUMP templates and therefore it is rather usefule sometimes. It is easiest 
to get with the deejump packege 
http://wiki.deegree.org/deegreeWiki/OpenJumpPackages.
Deegree adapters give also two alternatives for normal saving, either normal 
shapefile or GML saving or saving to zip file. Therefore I would not say that 
the two-step selection is useless, even it is true that we do not need the 
extented possibilities much at the moment.

Quantum GIS is showing a long list of file types and on the bottom stands "All 
files". I think that selecting "All files" leads to automatic selection of the 
file type by GDAL/OGR. It is quite clever in investigating the file structure 
and recognising the file type. I can believe it has taken a lot of tricky 
programming. If user selects a certain driver it is only possible to open files 
with a fixed file name extension. For example after selecting Spatialite only 
files ending .sqlite are listed.

QGIS can have different drivers for the same file type even the standard 
installation seems to use OGR for everything. I can see from the list one 
example where same file name extension is used by two OGR drivers. There seems 
to be INTERLIS 1 and INTERLIS 2 usind extensions .itf, .xml, .ili, .ITF, .XML, 
or .ILI. I think that it means that user MUST use one of there registered file 
name extensions, because if the name was for example .interlis then user must 
select "All files" in the first step and after that it is up to OGR what driver 
gets selected. It is possible that OGR knows the difference between INTERLIS 1 
and INTERLIS 2 but anyway it is out of the control of the user.

I tried to fool QGIS by selecting "INTERLIS 1" driver and filtering filename 
list by *.shp. QGIS opens the shapefiles also this way which means that OGR is 
quietly dropping the Interlis driver and the file is opened with OGR shapefile 
driver.

Naturally using some own file name extensions is usually stupid but as Martin 
said there is no standard extension for GML/XML, text files appear with many 
equally good extensions like .txt or .csv or something else and perhaps someone 
would like to use something shorter than .geojson or .sqlite.

Now I wonder if deegree shapefile and GML adapters can really only save into 
zipped format but not open it, or is it so that the different dialogue we have 
for opening files has dropped that alternative.

-Jukka Rahkonen-


Martin Davis wrote:

 
> One reason for having the double choice of both format and 
> file name is 
> that there are formats (such as GML) which don't have a standard file 
> extension that can be used to drive the choice of format.
> 
> Also, in JUMP originally we supported a zipped shapefile concept.  It 
> had the extension .zip, but was read by the Shapefile driver.
> 
> One thing that could be do would be to use the file extension 
> to drive 
> the initial format setting, but allow it to be overridden for 
> files with 
> non-specific extensions.
> 
> I'm also curious how other apps (such as QGIS) handle this?
> 
> On 10/12/2011 1:30 PM, edgar.sol...@web.de wrote:
> > On 12.10.2011 22:18, Michaël Michaud wrote:
> >> Hi,
> >>
> >> Le 12/10/2011 21:55, edgar.sol...@web.de a écrit :
> >>> On 11.10.2011 02:10, Stefan Steiniger wrote:
> >>>> The first bug I encountered is MacOSX specific - and we 
> probably forgot
> >>>> aboout that "save-ing" bug. I.e. there is no "field" in 
> the Save Dataset
> >>>> As dialog to write a name.. one can only chose existing files :(
> >>> funny enough it comes up for gml 2.0 ...
> >>>
> >>> still the whole _double_ drop down select format seems 
> senseless. any objections to redesign it to industry standard 
> one dropdown select format?
> >> Can't remember a reason for the current design.
> >> I agree this is redundant, even if a single combobox will 
> not allow to
> >> choose a format and display either files with this format extension
> >> and/or files with any extension (not sure it is useful).
> >>
> > check an application of your choice. this is how a save 
> dialog works usually. select a format, files according 
> selected formats extensions are shown.. choose one or enter 
> your own name.
> >
> > ede
> >
> > 
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> --------------------------------------------------------------
> ----------------
> All the data continuously generated in your IT infrastructure 
> contains a
> definitive record of customers, application performance, security
> threats, fraudulent activity and more. Splunk takes this data 
> and makes
> sense of it. Business sense. IT sense. Common sense.
> http://p.sf.net/sfu/splunk-d2d-oct
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> 

<<attachment: OJ_format_filename.jpg>>

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All the data continuously generated in your IT infrastructure contains a
definitive record of customers, application performance, security
threats, fraudulent activity and more. Splunk takes this data and makes
sense of it. Business sense. IT sense. Common sense.
http://p.sf.net/sfu/splunk-d2d-oct
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