[Gdal-dev] VRT format Schema

[Antoine Hue]

Since I got no answer to my question about an available DTD or Schema 
for the VRT format; and since I wanted to understand a bit more about 
the VRT, I have created a schema for it based on the HTML doc and based 
on code browsing.
Please find it attached as well as a picture generating from it by 
oXygen.

There are still a few dark zones and area to improves:
- ComplexSource and AverageSource need a complete definition
- Better definition of the subClass property of the VRTRasterBand 
needed.
- An explicit definition of the raw raster source (to go with 
SimpleSource, KernelFilteredSource,..) would improve homogeneity.
- Kernel's Coefs and Size could be more explicitly defined.
- Same thing for GeoTransform

I have validated it with examples of the VRT HTML doc (tutorial). 
Examples need to get modified a bit to refer to the schema as shown in 
the example file attached.

When completed, we may set it online on the www.gdal.org, some 
modification of the definition and link is then needed.

I think VRT really makes sense as a way to geo-reference rasters. It is 
quite extensive and may get embedded inside a larger XML document.
For this latter alternative, it may make sense to wrap into an XML 
namespace.
We may also extend it to better support rasters representing elevation.

Antoine Hue
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