I'd like to propose some additional changes to the current way we load 
file based datasets and images.

Currently we have the following

- Load Dataset plugin which works for single layer file based formats 
(e.g. shp, gml)
- Add Image Layer (geotiff, jpg, mrsid, ecw)
- Add MrSid layer (mrsid)

I think that we need a single plugin in the File menu called Open File

This plugin would allow you to select one or more files to load in and 
then invoke the specific plugin to handle that kind of file. This would 
separate the file selection UI from the code to load that type of image.

The OpenFilePlugins would be registered in the registry and would have a 
description and list of supported file types that could be used by the 
main Open file plugin to generate the list of formats in the drop down.

If a file type has additional options that need to be selected these 
would be asked in a dialog for that plugin before it opens the files. 
There maybe a nice way to bundle all these options into a single dialog 
to simplify the user experience.

The open file plugin would take responsibility for unzipping any zip 
files and passing off the contents to the other plugins to load the 
appropriate files.

I'm going to have do an investigation and create a plugin to demonstrate 
this.

Paul

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