+COMMONSQL INCOMPATIBILITY
+
+ o variables (e.g., table identifiers) should be instantiated at runtime
+ o userenv (Oracle specific but deprecated in Oracle 9)
+
+VARIANCES FROM COMMONSQL
+
+COMMIT,ROLLBACK,START-TRANSACTION:
+ When COMMIT or ROLLBACK are called outside of WITH-TRANSACTION, an sql
+ transaction must be explicitly started first with START-TRANSACTION.
+
+OPTIMIZATIONS
+
+* Revisit result-type list creation, perhaps caching
+
+POSSIBLE EXTENSIONS
+
+* extend large object support to databases beyond postgresql, improve large object api
+* add support for prepared statements
+* port Oracle backend to UFFI
+
+
+NOTES ABOUT THE BACKENDS
+
+MYSQL
+
+drop-index: requires a table to be specified with the :from keyword parameter
+views: mysql does not support views
+queries: nested subqueries are not supported
+syntax: doesn't support the sql concatenation operator (||).
+
+SQLITE
+
+create-view: column-list parameter not supported
+syntax: doesn't support the sql SUBSTRING operator.