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Bulk mutation on big schemas through schema model API seems to be slow. For example, adding an annotation with one appinfo with "source" attribute set to every element declaration (global and local) of the attached ADT_A01.xsd (plus all XSDs it references) takes about 150 seconds on a Dell Latitude D600 Laptop with 2GB of RAM. The number of element declarations being modified is 2683.
Created attachment 38311 [details] XSD for HL7 message ADT_A01