Some more conventions.

CodingStyle

@@ -43,6 +43,27 @@ Files are terminated by *one* CR (0x0a) character; not two.  This is the only
 place where you MUST pay attention to file size.
 
 
+Sorting
+-------
+Imports are sorted alphabetically, with:
+  * Python standard modules first
+  * Non standard modules second
+  * Expression modules last
+
+Classes within one file are sorted alphabetically.
+
+Attributes are placed before methods and sorted alphabetically.
+All attributes must be explicitly declared (be it an instance or
+a class attribute).
+
+Methods within a class are sorted alphabetically.
+
+
+Quotes
+------
+Enclose strings using double quotes, not single quotes.
+
+
 Disagreement
 ------------