The HSQL 2.0 documentation does not appear to address SQL syntax comments at all. One can guess from the examples that two hyphens at the beginning of the line introduce a comment line. But other questions remain, such as: can double-hyphen be used later in (not at the beginning of) a line? are there other comment characters that are allowed (such as // or /* */ etc)?
Please explicitly document this feature of the SQL syntax as implemented by HSQLDB, including adding it to the appropriate indices and contents. Thanks.