CAVIAR D16 Context model specification tool User Manual
Contents
1. A context file is associated to a context editor The context editor is composed of three parts e the toolbar e the palette e the graphical editor CAVIAR WorkPackage 5 Deliverable D16 1 Java context ctxt Eclipse SDK File Edit Petri Navigate Search Project Context Compiler Run Window Help Pay B Petri Compiler B ter Or amp af G amp e aw t Sy cv m Java fa ott i Package Explorer 3 O M o S ajag 2 6 me Ue 2 C8 ne Br Outline 53 a pe v Wrest b BAJRE System Library sun jdk 1 ig My shapes My shapes gef Problems Javadoc Declaration El Console 23 Ek a Re DD SVN 3 2 Context palette The palette allows to select object to create roles relations transitions and situations Situations and transitions can be linked to create the situation graph CAVIAR WorkPackage 5 Deliverable D16 1 DJS 07W 8g G5 09 v Select Ui Marquee Connections situation Transition Aa Role Relation 3 3 Roles To create a new role select the role tool in the palette and click in the editor A default role named unspecified is created The role attributes can be edited in the eclipse property window If this window is not yet opened in your environment select it in the Window Show view property menu The role properties that can be e2. En When the test is applied to multiple entities the most suitable entity may be selected based on a confidence factor CF The set of entities is not bijective with the set of roles One or more entities may play a role A role may be played by one or several entities The CAVIAR WorkPackage 5 Deliverable D16 1 assignment of entities to roles may often will change dynamically Such changes provide the basis for an important class of events 1 3 Context A context model is a graph in which situations are connected by arcs Theses arcs repre sent temporal constraints between the situations They are decorated using the temporal operators defined by Allen 1 Relation Graphical example X before Y L X meets Y X overlaps Y ue ba X starts Y l 1 I bl X equals Y l I X during Y L I n X finishes Y i The graph structure is given by the temporal relations A path inside the graph is the result of the observation of the on going situations 1 4 Events A situation is the assignment of entities to roles and the relations between these entities A change in the assignment of entities to roles or a change in the relations between those entities is represented as a change in situation Such changes in situation constitute an important class of events that we call Situation Events A Situation Event triggers a node changing in the context graph 1 5 Petri Nets
3. The context is a graph of situations linked together with temporal relations The transitions are event driven and are based on observed Situation Events If we associate Situations to Places and Situation Events to Transitions the conceptual graph can then be mapped on the Petri Nets formalism CAVIAR WorkPackage 5 Deliverable D16 1 1 6 Software architecture Specifying a context is part of the development process of a context aware application In the same manner that GUI builders are part of the integrated development environments the context specification tool should also be integrated in the IDE We have selected an open source multi language platform Eclipse 1 6 1 The Eclipse framework Eclipse 2 is an open source IDE mainly written in Java It is available on many platforms as Windows MacOS X Linux and Solaris Eclipse is e an open platform proposing a plug in mechanism based on the OSGI standard 3 e a set of plug ins proposing basic IDE services editors property sheets code browser etc e A plug in for the Java language programming Eclipse functionalities can be extended by downloading new plug ins like C program ming environment GUI builder UML modeler etc 1 6 2 Context plug ins We have developed several plug ins to add context functionality to the Eclipse Platform 1 a context model plug in 2 a context editor 3 context compilers see section 4 The context model plug in manages the data
4. eee R dox a 6 Ae Tonet AIS uu dox wee ee ce RAE SS RoS EEE RES ee ys 8 Fo Role ee ke oe es Bp 23 9 E A Ren d Bae PB eee 9 Oa Relations e kor eae Ke eee Xe IOXC ee Poe oR EUR whe x 10 3 DIMUS Lu ee es cader rad et Db C ouk eee we Kawi eR Ee A 10 36 Graph construction se s e soca re aom ee RE HEE Se RE ES 12 4 Code generation 13 CAVIAR WorkPackage 5 Deliverable D16 1 1 Fundamental concepts The Context model specification tool is an Eclipse Plug in that let the user graphically edit a context model and transform it into a recognition program A recognition program is a program interpreting perceptual data and verifying that they correspond to the context model Before describing the modeling tool we will first describe the basic concepts 1 1 Situations The fundamental concept for our framework is the concept of situation A situation is defined using a predicate expression The logical functions that make up this expression are functions of properties observed in the world Each possible combination of predicates or their negation defines a state A context is a composition of situations that share the same set of roles and relations Thus a context determines the collection of roles and relations to observe These are the roles and relations that are relevant to the task of the user Contezt U T Role Roles Rolen Relation Relation 1 2 Roles A role is potential set of actions within a task The actions of a
5. role may be enabled by certain entities When an entity enables the actions of a role it is said to be able to play the role For example when a human actor walks to the front and addresses a group he can be said to play the role of teacher When he uses a laser to direct attention to an image the laser plays the role of pointer The director determines if an entity can satisfy a role by applying an acceptance test The system may anticipate and monitor such entities based on their properties Such assignment is provided by a process that applies the test to observable variables An object may serve as a pointer if it is of a graspable size and appropriately elongated In the user s environment pens remote controls and even a wooden stick may all meet this test and be potentially used by the user to serve the role A system to observe the act of pointing as a situation must recognize that any of these objects can play the role of pointer The set of entities that can provide a role may be open ended In the users context the user determines if an entity can satisfy a role for a task by applying the acceptance test The system may anticipate and monitor such entities based on their properties In the system s context the system may assign entities to roles Such assignment is provided by a process that applies a predicate function defined over entities and their properties Role E E Em Role Class ID CF Ej Fo
6. structure representing a context list of roles relations and graph of situations inside Eclipse It proposes an API to load and save a context in an XML file using the XMI format and access all the elements More details on this API is given in the programmer s reference document Deliverable D16 1 WorkPackage 5 CAVIAR juresuo2 gt lt miensuo H api B Aue c ajou ETEN Rat Vas ajoa suonenyssnomasd L ajoyuonemis E uonisueij 7 uogejal y ubusu amp g wg Ape c uopej y H uonejs1 uongie1 ioseumm El Si m wis lasu yo wg Jdouoyenys c A LX uongnys vt x uonenmis 7 ajd eoeld Jayauesed Suysa auieu c3 3oelqoeera anea c Bursa uonduosep pefqopeuew E 189jeure1eq A pefqouagpaie2o E CAVIAR WorkPackage 5 Deliverable D16 1 2 Software installation In this section we will explain how to get and install the software 2 1 Pre requisite The context editor requires two additional plug ins to work e EMF 2 1 0 Eclipse Model Framework http download eclipse org tools emf scripts downloads php e GEF 3 1 Graphical Editing Framework www eclipse org gef Those two plug ins must be first downloaded and unpacked in the Eclipse directory 2 2 Getting the software The plug ins are available on the Prima web site e context zip the formal context model e
7. CAVIAR Context Aware Vision using Image based Active Recognition ST 2001 37540 D16 Context model specification tool CAVIAR Date Author s Work package Document status Usage Keywords User Manual D16 1 Context model specification tool User manual 20 October 2005 Patrick Reignier 5 Version 1 0 Internal Context toolkit Petri nets Production rules Eclipse plugins CAVIAR WorkPackage 5 Deliverable D16 1 Abstract This document is the user manual of the context modeling tool The context modeling tool is a graphical tool integrated in the Eclipse IDE It allows to graphically specify a context model as a set of relations roles situations and a graph of situations This context model can then be compiled into a corresponding recognition program Contents 1 Fundamental concepts 1 LI OA 221a bp uou Le ee BR de Retos ou EEDA 1 e o DEPT 1 e eee he ee a a eS ADA GEES SR OEE ER BS 2 LA E 0 22 ea ee ee e E E uas ee bees Be ET 2 Lo Peti Neis ag a ki a eh we AR ee pae wy ee RR E a ia a g 2 1 6 Software architecture ooo eb o dox 9o ee eS 3 1 6 1 The Eclipse framework len 3 1 6 2 Context plug ins ous Roo oo ox Ro Pee Re ee wD x 3 2 Software installation 5 21 INMQGUEEUNE ceuec deee CRY ee ds SOS RE EE EUR Ro 5 Z4 Getinge lhe tones Loo dea E ee AK Bae OK o beoe ee 5 cS o a ce sn soeone m eeni OS BOR AE Ak ADS Row oS ee 5 3 Context editor 5 ml Cresinea dew CONTE o 2222 hoe do nk de
8. D Walking Brown 3 d p pone Problems Javadoc Declaration Console Error Log I Properties 23 8 RR Yep Property value 2 constraints description no description Initial eitritinn Clicking the edit button will open a new dialog box This dialog box displays for every situation connecting to the currently edited one the associated roles The user can 11 CAVIAR WorkPackage 5 Deliverable D16 1 select those that must share the same entities with the target role Situation Init C newComer Situation Browsing O browser e description a textual description of the situation e initial situation a boolean indicating if this situation is the first situation of the currently edited context A situation can be deleted using the contextual menu right mouse click 3 6 Graph construction As we have seen in section 1 5 the context is a Petri Net where places are situations In a Petri Net places are linked together through transitions Transitions can be created using the transition tool in the editor palette 12 CAVIAR WorkPackage 5 Deliverable D16 1 file Edt Petri Navigate Search Project Context Compiler Run Window Help etri Compiler 6 d Q Q u di G 8 S I e OS ty m chron de gs mt iso v nS rowsing cit m pra Walkin Browsing pem i b d Leaving 4 Code generation The situ
9. an be edited in the eclipse property view If this window is not yet opened in your environment select it in the Window Show view property menu The situation properties that can be edited are s A s Problems Javadoc Declaration Console E3 Properties 72 Property Value description no description Initial Situation 0 name Situation15 relations roles e name the name of the situation e roles the list of roles associated to this situation The role selection is done through a dialog box showing all the available roles in the current context 10 CAVIAR WorkPackage 5 Deliverable D16 1 Roles selection Available Roles Selected Roles lecturer mE audience speaker OK Cancel e relations the list of relations associated to this situation The relation selection is done through a dialog box showing all the available relations in the current context e constraints it is possible to specify that some roles of two following scenarios must share the same entities For instance a browsing scenario specify a walking situation followed by a browsing situation We can specify that it must be the same person playing the walker and browser role Clicking in the constraint field on the property sheet opens a dialog box This dialog box allows to select a role in the current situation the sl target role Available Roles walker Edited situation Ye rs A z i di
10. ation graph built with the editor is a formal model of a context This model must be transformed into a corresponding program that will have to analyse the incoming perceptual events to determin if they are compatible with the model This compilation is a model transformation from a conceptual model to an executable model We provide two initial compilers 1 A Petri to Synchronized Petri net model transformation producing a Jess set of rules 2 A Petri to HMM transformation producing a Java program Each compiler is a plug in petriCompiler zip hmmCompiler zip that must be installed on the eclipse distribution The compiler can be started on the current context model using the Context Compiler menu on the menu bar Details can be found in the Context Compiler reference manual on how to write a new context compiler References 1 J F Allen Towards a general theory of action and time Artificial Intelligence 13 1984 2 13 CAVIAR WorkPackage 5 Deliverable D16 1 2 Eclipse http herzberg ca sandia gov jess 3 3 The osgi service platform dynamic services for networked devices http www osgi org 3 14
11. contextEditor zip the graphical context editor plug in e petriCompiler zip the context compiler to Jess rules e hmmCompiler zip the context compiler to Jess rules 2 3 Installation 1 Unzip the three plug ins into the Eclipse installation directory 2 Restart Eclipse using the following command eclipse clean The clean argument tells Eclipse that new plug ins have been installed It is nec essary on Windows installation 3 Context editor We will present in this section how to use the context editor by illustrating the different steps creating a new context defining roles relations creating situations based on those roles and relations and finally specifying the temporal constraints between situations using transitions and links l http www prima inrialpes fr reignier softs 5 CAVIAR WorkPackage 5 Deliverable D16 1 3 1 Creating a new context The Context Wizard allows to create a new context file This context file must be stored into an existing Eclipse project a Java project for instance Select a wizard Petri context creation wizard Wizards G Class Interface iS Java Project Java Project from Existing Ant Buildfile 5 Plug in Project amp Product Configuration v amp Context Context Wizard CAVIAR WorkPackage 5 Deliverable D16 1 New Petri Context Creates an empty Context model Enter or select the parent folder est Ci File name context 2 ctxt
12. dited are e arity A role is a predicate used to select entities The arity indicates how many entities are necessary to define this role The usual value is 1 e description It is a textual value describing the role e name The name of the predicate This name is used in the code generation modules A role can be deleted using the contextual menu right mouse click Problems Javadoc Declaration Console E AJT AITE Property arity description no description name unspecified CAVIAR WorkPackage 5 Deliverable D16 1 3 4 Relations To create a new relation select the relation tool in the palette and click in the editor A default relation named unspecified is created The relation attributes can be edited in the eclipse property view If this window is not yet opened in your environment select it in the Window Show view property menu The relation properties that can be edited are e arity A relation is a predicate between entities The arity indicates how many entities are in relation e description It is a textual value describing the role e name The name of the predicate This name is used in the code generation modules A relation can be deleted using the contextual menu right mouse click 3 5 Situations To create a situation select the situation tool in the palette and click in the editor A new situation is created with an automatically generated name The relation attributes c
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