You generate the annotated schema file by selecting it as an additional target for standard schema generation.
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Select
schema File to open the Generation dialog box.
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Specify the directory in which to generate the file and select the XML in Database target on the Targets tab.

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Click OK to begin the generation.
The Result dialog box is displayed with the path of the annotated schema file selected.
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Click Edit to open the generated annotated schema in your associated editor:

Note the Oracle namespace (with the sql prefix) and annotations for tables (sql:SQLName) and ADTs (sql:SQLType)