[gdal-dev] OAPIF: how does the driver utilize schema?

[Even Rouault]

Hi Jukka,
>
> The documentation in 
> https://gdal.org/drivers/vector/oapif.html#layer-schema is wrong when 
> it claims this:
>
> OGR needs a fixed schema per layer, but OGC API - Features Core 
> doesn't impose fixed schema. So the driver will retrieve the first 
> page of features (10 features) and establish a schema from this.
>
> I can see from the debug info and from the source code that if GDAL 
> finds a relation of type “describedBy” for a collection then it reads 
> and interprets the schema from the link. However, I am not sure if 
>  GDAL in this case trusts the schema and skips scanning of the first 
> ten features for harvesting the attributes.
>
It doesn't fully trust the schema provided by describedBy and still 
scans the first page of feature to complement it. Doc adjusted
>
> BTW, the name of the relation type has been changed into “describedby” 
> due to https://github.com/opengeospatial/ogcapi-features/issues/338. 
> It is better to support both describedBy and describedby.
>
Thanks. Fixed too (GDAL made case insensitive comparisons)

Even

> -Jukka Rahkonen-
>
>
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