Background: We have our own SQL map that predates InterSystems'. A program writes an XML file for each table map class as $system.OBJ.Export would. $system.OBJ.LoadDir loads the XML files into .cls files.
The reason is a long story, but we need to update parameter EXTENTSIZE (only) in existing classes. This does not seem to happen. As a test I used $system.OBJ.Export to make an XML file and edited EXTENTSIZE in the two places it appears in the XML:
<StorageStrategy>SQLStorage</StorageStrategy>
<Parameter name="EXTENTSIZE"><Default>1001</Default></Parameter>
<Storage name="SQLStorage">
<Type>%Storag



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