How to get the charset of the uploaded file

I am uploading xml files through apex application to the database server, then I will create xmltype from it. How would I know the charset of the xml file? There is a file_charset column in apex_application_files table. However it is null when I upload the xml file. How is this column used? Any help will be appreciated.
-Fengting

I found that there is a file_charset column in table apex_application_files. I thought apex will figure out the file charset and populate that column in the table after uploading the file. But it was null in my case. If I prompt the user to specify the charset, the charset value won't go into apex_application_files table.
It is true that an XML file is typically encoded in utf8 but there could be exceptions. When I create xmltype from the uploaded file in a blob, I need to provide the charset_id in the xmltype constructor. I hope I can provide the correct charset instead of a typical value of utf8.
So there is no standard or recommended way to get the file character set other than prompting to user?
Thanks,
-Fengting

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