[gdal-dev] VRT schema integer types serialization

[GUIMMARA, Sébastien (External) [FR]]

Hi all,

When trying to generate C# classes from the VRT schema provided with GDAL (gdalvrt.xsd), I came accross a known issue with XSD that doesn't map the xs:nonNegativeInteger type to a native integer type, but instead maps it to a string.

See this question for the rationale : https://stackoverflow.com/questions/9616040/why-does-xsd-exe-generate-string-property-for-xsinteger

To summarize, since nonNegativeInteger is unbounded, it is not possible to map it to a (bounded) native type (such as Uint32). Ironically, the VRT schema defines a custom type named "nonNegativeInteger32" that should exactly map to Uint32, but since it inherits from nonNegativeInteger, it still maps to a string.

My question is : would it be acceptable to modify the VRT schema to replace the unbounded integer types by appropriate bounded types (xs:int, xs:long, xs:unsignedInt, etc.), or would it break existing behaviour ?

See https://www.w3schools.com/xml/schema_dtypes_numeric.asp for available XSD datatypes.

Sébastien

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