Well, I realized that it was a small syntax error. It:
String SQL = "INSERT INTO (1,2,3) values(?,?,?)";
Must be:
String SQL = "INSERT INTO sections(idSections,Section1,Section2,Section3) values(?,?,?,?)";
since I need to specify the name of the table and also specify the id field.
There is no problem with the ooxml data in the xml extension, as it turns out, since the resulting query can be opened in MS Word (for which I aimed / wanted)
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