diff -r 887fa4aff71f -r e9a167ac98f3 devel-versioning.rst
--- a/devel-versioning.rst	Tue Aug 23 10:07:48 2011 +0300
+++ b/devel-versioning.rst	Tue Aug 23 10:07:58 2011 +0300
@@ -3,9 +3,57 @@
 =================
 .. contents::
 
+Release build version data.
+===========================
+
+ * Build number.
+ * Build date.
+ * Build version.
+ * Branch-tag used.
+ * Overnight build (Y/N).
+ * QA tested (Y/N).
+ * QA test results (Pass/Fail).
+ * Location of full logs.
+
+Order formula.
+==============
+
+if (A.major != B.major) return A.major > B.major;
+if (A.minor != B.minor) return A.minor > B.minor;
+if (A.patch != B.patch) return A.patch > B.patch;
+if (A.special == B.special) return 0;
+if (A.special == "") return 1;
+if (B.special == "") return -1;
+return A.special > B.special;
+
+**NOTE** Accoding to this definition 1.0.1rc1 < 1.0.1rc10 < 1.0.1rc2 which is
+non meaningful.
+
+Compatibility formula.
+======================
+
+Assume that app linked with new version of lib. Thus::
+
+  is_compatible_with_old(old, new) {
+    if (old.major != new.major) return 0;
+    if (old.minor > new.minor) return 0;
+    return 1;
+  }
+
+Assume that app linked with old version of lib. Thus::
+
+  is_compatible_with_new(old, new) {
+    if (old.major != new.major) return 0;
+    return 1;
+  }
+
 Reference.
 ==========
 
   https://developer.mozilla.org/en/toolkit_version_format
                 Toolkit version format
+  http://apr.apache.org/versioning.html
+                APR's Version Numbering
+  http://semver.org/
+                Semantic Versioning