The XmlPort is still not as good as it is supported in the windows client.

Could you please provide support to add a UsageCategory and ApplicationArea to XMLPorts?

Referencing Issues: https://github.com/Microsoft/AL/issues/1574

Additionally it would be helpfult to get a system table with metadata information of XMLPorts Parameters

Check out issue: https://github.com/microsoft/AL/issues/3186

I don't know how the XMLPorts are read, but it would be very helpful to add some progress window while processing large files to avoid freezing of the browser.

Alternativly you could provide some way of generic progress window on how many elements (lines for a CSV, nodes for XML) where parsed and how many are still missing...