GDAL_DCAP_UPDATE -> append for e.g. for GeoJSONSeq?

[theroggy]

What is the bug?

Since GDAL 3.11, in the context of RFC106, update capabilities can be discovered for drivers via the GDAL_DCAP_UPDATE/GDAL_DMD_UPDATE_ITEMS properties.

For GeoJSONSeq, "NO" is returned for GDAL_DCAP_UPDATE... probably because existing data cannot be updated in place. However... GeoJSONSeq does support appending... so I was actually expecting "YES" to be returned. Maybe an "append" option could be added to GDAL_DMD_UPDATE_ITEMS for vector file formats?

Steps to reproduce the issue

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Versions and provenance

GDAL 3.11.3

Additional context

• relevant pyogrio issue: Show append support in list_drivers geopandas/pyogrio#375
• relevant pyogrio PR: ENH: add whether append is supported in list_drivers geopandas/pyogrio#559

[jratike80]

I do not know how important "appendable" metadata is, but I think that CSV has the same capability.

[rouault]

Maybe an "append" option could be added to GDAL_DMD_UPDATE_ITEMS for vector file formats?

Once you've opened a dataset in update mode, you can run OGR_L_TestCapabality(hLayer, OLCSequentialWrite) to test for that

[theroggy]

The use case is rather to have a general overview of which drivers support what... similar to RFC106... not to check if you can append to a specific file.