Hi, Re-sending to the list without old discussion because the mail body grew too large and was rejected.
I do not have not much experience about GMLAS but I made a test with this file https://github.com/aixm/donlon/blob/master/EA_EADD_OBS_DS_AREA_2_3_4_FULL_20191205.xml and GDAL GMLAS found 1655 layers with "ogrinfo GMLAS:aixtest.xml" without editing the file so it seems that GDAL can follow http redirections and there is some other problem with your XML. Try the test files from GitHub and try to find out what is different in your GML. -Jukka Rahkonen-
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