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+
+Common ping format
+==================
+
+This defines the top-level structure of a Telemetry ping.
+It contains basic information shared between different ping types, which enables proper storage and processing of the raw pings server-side.
+
+It also contains optional further information:
+
+* the :doc:`environment data <../data/environment>`, which contains important info to correlate the measurements against
+* the ``clientId``, a UUID identifying a profile and allowing user-oriented correlation of data
+
+*Note:* Both are not submitted with all ping types due to privacy concerns. This and the data it that can be correlated against is inspected under the `data collection policy <https://wiki.mozilla.org/Firefox/Data_Collection>`_.
+
+Finally, the structure also contains the `payload`, which is the specific data submitted for the respective *ping type*.
+
+Structure:
+
+.. code-block:: js
+
+    {
+      type: <string>, // "main", "activation", "deletion", "saved-session", ...
+      id: <UUID>, // a UUID that identifies this ping
+      creationDate: <ISO date>, // the date the ping was generated
+      version: <number>, // the version of the ping format, currently 4
+
+      application: {
+        architecture: <string>, // build architecture, e.g. x86
+        buildId: <string>, // "20141126041045"
+        name: <string>, // "Firefox"
+        version: <string>, // "35.0"
+        displayVersion: <string>, // "35.0b3"
+        vendor: <string>, // "Mozilla"
+        platformVersion: <string>, // "35.0"
+        xpcomAbi: <string>, // e.g. "x86-msvc"
+        channel: <string>, // "beta"
+      },
+
+      clientId: <UUID>, // optional
+      environment: { ... }, // optional, not all pings contain the environment
+      payload: { ... }, // the actual payload data for this ping type
+    }