Use subst instead of string quoting to improve readability (syntax highlighting) Drop -postgresql.xql for "create_table" since there is no -oracle.xql and the -postgresql.xql is identical to inline code.
Revert massive replacement of empty list creation sentences. The use of '[list]' instead of '{}' adds semantics that could be used for performance improvements in the future, such as using a different internal representation. There is already work in this direction, avoiding the generation of the string representation during comparison of empty strings (huge thanks to Stefan Sobernig for the pointer: https://core.tcl.tk/tcl/info/44527c632ed609c2).