--- a/java/sql-dk/src/info/globalcode/sql/dk/formatting/Formatter.java	Sun Dec 22 22:02:44 2013 +0100
+++ b/java/sql-dk/src/info/globalcode/sql/dk/formatting/Formatter.java	Sun Dec 22 23:31:55 2013 +0100
@@ -37,7 +37,7 @@
 
 	void writeQuery(String sql);
 
-	void writeParameters(List<Parameter> parameters);
+	void writeParameters(List<? extends Parameter> parameters);
 
 	void writeColumnsHeader(ColumnsHeader header);