# HG changeset patch
# User Oleksandr Gavenko <gavenkoa@gmail.com>
# Date 1316957500 -10800
# Node ID 4ddb673763e6bd892dc2492b9e715af8b132112c
# Parent  f7a62b2027ea0181526531bbf46b114a4372a91c
Forms of compatibility.

diff -r f7a62b2027ea -r 4ddb673763e6 devel-versioning.rst
--- a/devel-versioning.rst	Sun Sep 25 16:08:12 2011 +0300
+++ b/devel-versioning.rst	Sun Sep 25 16:31:40 2011 +0300
@@ -161,6 +161,22 @@
 
   GLib GTK+ Gimp GNOME Kaffe
 
+Forms of compatibility.
+=======================
+
+Runtime of binary compatibility mean that binary can be swaped with another
+version without breaking.
+
+Compile time or source compatibility mean that supplied header/interfaces allow
+successful compiling/linking.
+
+Example:
+
+ * Change type of argument in method to more generic take source compatibility
+   but break binary compatibility.
+ * Adding new mothod to abstract class take binary compatibility but break
+   compilation (unimplement method error).
+
 Compatibility formula.
 ======================