+16 Jul 2004 Marcus Pearce <m.t.pearce@city.ac.uk>
+ * sql/oodml.lisp: on Lispworks, use weak valued hash tables for
+ object caching.
+ * sql/expressions.lisp: Fix SQL generation for the symbol NIL.
+
+16 Jul 2004 Marcus Pearce <m.t.pearce@city.ac.uk>
+ * sql/expressions.lisp: reactivate caching of generated SQL strings.
+ Move methods for DATABASE-OUTPUT-SQL, OUTPUT-SQL and SQL-HASH-KEY
+ here from sql/fdml.lisp. Rationalise behaviour of SQL-OUTPUT,
+ OUTPUT-SQL and DATABASE-OUTPUT-SQL.
+ * sql/fdml.lisp: remove disabled method ADD-STORAGE-CLASS. Move
+ methods for DATABASE-OUTPUT-SQL, OUTPUT-SQL and SQL-HASH-KEY to
+ sql/expressions.lisp.
+ * sql/ooddl.lisp: replace call to DATABASE-OUTPUT-SQL in
+ DATABASE-PKEY-CONSTRAINT with call to SQL-OUTPUT.
+ * sql/generics.lisp: add docstrings.
+