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Signed-off-by: Sebastien Douheret <sebastien.douheret@iot.bzh>

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+
+Application framework
+=====================
+
+Foreword
+--------
+
+This document describes application framework fundamentals. 
+FCS (Fully Conform to Specification) implementation is still under development.
+It may happen that current implementation somehow diverges with specifications.
+
+Overview
+--------
+
+The application framework on top of the security framework
+provides components to install and uninstall applications
+as well as to run them in a secured environment.
+
+The goal of the framework is to manage applications and hide security details
+to applications.
+
+For the reasons explained in introduction, it was choose not to reuse Tizen
+application framework directly, but to rework a new framework inspired from Tizen.
+
+fundamentals remain identical: the applications are distributed
+in a digitally signed container that should match widget specifications
+normalized by the W3C. This is described by the technical
+recommendations [widgets] and [widgets-digsig] of the W3 consortium.
+
+As today this model allows the distribution of HTML, QML and binary applications
+but it could be extended to any other class of applications.
+
+The management of widget package signatures.
+Current model is only an initial step, it might be extended in the
+future to include new feature (ie: incremental delivery).
+
+
+Comparison to other frameworks
+------------------------------
+
+ - Tizen framework
+
+ - xdg-app
+
+ - ostro
+
+### Organization of directory of applications ###
+
+The main path for applications are: APPDIR/PKGID/VER.
+
+Where:
+
+ - APPDIR is as defined above
+ - PKGID is a directory whose name is the package identifier
+ - VER is the version of the package MAJOR.MINOR
+
+The advantage of such an organization is to allow several versions to live together.
+This is required for multiple reasons (ie: roll back) and to comply with developers habits.
+
+#### Identity of installed files ####
+
+All the files are installed as user "userapp" and group "userapp".
+All files have rw(x) for user and r-(x) for group and others.
+
+This allows any user to read files.
+
+
+#### Labeling the directories of applications ####
+
+
+### Organization of data ###
+
+The data of a user are contain within its directory and are labeled using the application labels
+
+### Setting Smack rules for the application ###
+
+For Tizen, the following rules are set by the security manager for each application.
+
+    System ~APP~             rwx
+    System ~PKG~             rwxat
+    System ~PKG~::RO         rwxat
+    ~APP~  System            wx
+    ~APP~  System::Shared    rxl
+    ~APP~  System::Run       rwxat
+    ~APP~  System::Log       rwxa
+    ~APP~  _                 l
+    User   ~APP~             rwx
+    User   ~PKG~             rwxat
+    User   ~PKG~::RO         rwxat
+    ~APP~  User              wx
+    ~APP~  User::Home        rxl
+    ~APP~  User::App::Shared rwxat
+    ~APP~  ~PKG~             rwxat
+    ~APP~  ~PKG~::RO         rxl
+
+Here, ~PKG~ is the identifier of the package and ~APP~ is the identifier of the application.
+
+### What user can run an application? ###
+
+Not all user are able to run all applications.
+How to manage that?
+
+[meta-intel]:       https://github.com/01org/meta-intel-iot-security                "A collection of layers providing security technologies"
+[widgets]:          http://www.w3.org/TR/widgets                                    "Packaged Web Apps"
+[widgets-digsig]:   http://www.w3.org/TR/widgets-digsig                             "XML Digital Signatures for Widgets"
+[libxml2]:          http://xmlsoft.org/html/index.html                              "libxml2"
+[openssl]:          https://www.openssl.org                                         "OpenSSL"
+[xmlsec]:           https://www.aleksey.com/xmlsec                                  "XMLSec"
+[json-c]:           https://github.com/json-c/json-c                                "JSON-c"
+[d-bus]:            http://www.freedesktop.org/wiki/Software/dbus                   "D-Bus"
+[libzip]:           http://www.nih.at/libzip                                        "libzip"
+[cmake]:            https://cmake.org                                               "CMake"
+[security-manager]: https://wiki.tizen.org/wiki/Security/Tizen_3.X_Security_Manager "Security-Manager"
+[app-manifest]:     http://www.w3.org/TR/appmanifest                                "Web App Manifest"
+[tizen-security]:   https://wiki.tizen.org/wiki/Security                            "Tizen security home page"
+[tizen-secu-3]:     https://wiki.tizen.org/wiki/Security/Tizen_3.X_Overview         "Tizen 3 security overview"
+
+