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[[Image:AmwLogo.png|right]]

The [http://www.eclipse.org/gmt/amw/ AMW] ('''ATLAS Model Weaver''') project is a [[GMT]] component developed by the [http://www.sciences.univ-nantes.fr/lina/gdd ATLAS group], [http://www.inria.fr/ INRIA]. AMW is part of the [[AMMA]] platform.

The Atlas Model Weaver supports the creation of different kinds of links between model (or metamodel) elements. The links are saved in a '''weaving model'''. The weaving model conforms to an extensible weaving metamodel.

Weaving models can be used in different application scenarios, such as tool interoperability, transformation specification, traceability, model merging, model comparison.

==Core weaving metamodel==

The AMW is developed based on a [http://www.eclipse.org/gmt/amw/zoo/#AMW%20core core weaving metamodel]. This core metamodel supports basic link management, i.e., n:n relationships between model elements. The identifiers of the referred elements can be saved using different identification methods. The core weaving metamodel is illustrated below.

[[Image:AmwCoreMetamodel.png|center]]

''WElement'' is the base element from which all other elements inherit. It has a name and a description. ''WModel'' represents the root element that contains all model elements. ''WLink'' denotes the link type. ''WLink'' has a reference ''end'' to associate it with a set of link endpoints (''WLinkEnd''). Each ''WLinkEnd'' references one ''WElementRef''. The attribute ''ref'' contains the identifier of the linked elements. ''WElementRef'' is not referenced directly by ''WLink'' because it is possible to reference the same model element by different link endpoints, for example one model element may participate in more than one mapping expression. ''WModelRef'' is similar to ''WElementRef'', but it contains references to the models.

==Metamodel extensions==

The different kind of semantics of a weaving metamodel are defined in extensions to the core weaving metamodel. The different [[weaving metamodel extensions]] can be applied in different application scenarios. They
are available for download in the [http://www.eclipse.org/gmt/amw/zoo/ Weaving metamodel Zoo]. 
The [http://www.eclipse.org/gmt/amw/usecases/ use cases] section provides complete scenarios that use these metamodel extensions.

===How to create weaving metamodel extensions===
The [[AMW FAQ]] explains how to create weaving metamodel extensions.

==AMW plugin==

The AMW prototype is developed as an Eclipse plug-in. It uses [http://www.eclipse.org/emf/ EMF] as base model handler. The prototype is a generic workbench for weaving models. It provides a set of extension points definition to enable to customize the interface according to different metamodel extensions. An example of the interface is shown below. 

[[Image:AmwScreenShot.png]]

=== AMW plugin extensions ===

The first contribution to the AMW interface is the base weaver extension plugin (''org.eclipse.weaver.extension''). This extension enables to use the AMW plugin with the basic functionalities. This extension is provided for download together with the core weaver plugin (''org.eclipse.weaver'').

===Automatic generation of weaving models===

The AMW plugin is used to manually create weaving models. However, it is possible to semi-automatically generate these models. Weaving models are generated using '''matching transformations'''. Matching transformations are transformations that execute matching heuristics to create a set of links based on a similarity value. This value can be calculated in different ways, for example by using the edit distance between two strings, or by using the structural relationships (e.g., containment, inheritance) between model elements. 

The AMW plug-in is integrated with ATL to be able to execute matching transformations directly from the main user interface. The matching transformations are implemented in the ''org.eclipse.weaver.transformation'' plug-in.

These transformations are also available separately in the [http://www.eclipse.org/gmt/amw/examples/#Matching%20transformation%20library Matching transformation library].

===AMW Model Handler===

The AMW Model Handler enables a better integration of ATL transformations and weaving models. It provides a set of primitives constantly needed when developing transformations that have weaving models as input or output.

The [[AMW Model Handler]] page contains detailed information on how to download, to install, and to use the new primitives.

===Graphical development of ATL transformations===

The Atlas Model Weaver has a new plug-in extension that enables to graphically develop simple ATL transformations. This extension enables to create simple ATL transformations using the graphical interface of AMW. This extension does not intend to support all the features of the ATL metamodel. It is a first step to rapidly develop ATL transformations.

The plug-in is available at the [http://www.eclipse.org/gmt/amw/download/ Download section], in the deployment build. The plug-in name is "org.eclipse.gmt.weaver.qatl". It contains the weaving metamodel extension, the sources, and an illustrative example. We explain below how to use this extension.

First it is necessary to create a weaving model using the AMW wizard (this is explained in details in the [http://dev.eclipse.org/viewcvs/indextech.cgi/org.eclipse.gmt/AMW/org.eclipse.weaver.doc.user/index.html User Guide]).

It is necessary to do the following steps:

* In the first page of the wizard, select the ''metamodels/mmw_qalt.km3'' extension. 

* In the second page, select a name for the weaving model.

* In the third page, add two new metamodels (''Add model'' button), one for the input and other for the output. The input model must be associated with the ''InModelRef'', and the output model with the ''OutModelRef''.

* After that, a weaving model only with a ''Module'' element is created. The user must use the context menu (right-click) to create the weaving elements. The prototype proposes the valid elements, such as ''rules'', ''input'' and ''output'' elements, ''bindings''.

An example of weaving model is shown in the Figure below. 

[[Image:SimpleATL.jpg]]

After the weaving model is created, the user should generate the corresponding ATL model. This action is available in the context menu, '''Simple ATL to ATL'''. This action creates an ATL model in the same folder as the weaving model (e.g., ''family2person_atl.ecore''). The last step is to extract this model into the ATL concrete syntax, by right-clicking in the ATL model and choosing ''Extract ATL-0.2 model into ATL-0.2 file''

'''Remark''': 

* It is necessary to set the name to the ''Module''. For the other elements, the name is generated automatically. However,  it is advisable to use user defined names.

==Use cases==

Weaving models may be used in several application scenarios, such as metamodel comparison, traceability, model matching, model annotation, interoperability. This is because it is often necessary to establish links between elements of different models.

These use cases are implemented using AMW. AMW supports such a variety of application scenarios because it has an adaptive interface that handles different metamodel extensions (AMW is fully implemented using the reflective API of EMF).
The plug-in also provides a set of extensions points that enables to add new functionalities when necessary. 
A set of use case is found in the [http://www.eclipse.org/gmt/amw/usecases/ Use Cases] page. More information can also be found in the [[AMW FAQ]].

==Examples HowTo==

The [[AMW Examples HowTo]] contains additional information about the examples available for download in the AMW project web site.

==Publications==

[http://www.sciences.univ-nantes.fr/lina/atl/bibliography/SAC07 SAC07]
Del Fabro, MD, and Valduriez, P :Semi-automatic Model Integration using Matching Transformations and Weaving Models .
In: The 22th Annual ACM SAC, MT 2007 - Model Transformation Track, Seoul (Korea), 2007.
 
[http://www.sciences.univ-nantes.fr/lina/atl/bibliography/ODBASE06 ODBASE2006] 
	Didonet Del Fabro, M, Bézivin, J, and Valduriez, P : Model-driven Tool Interoperability: 
	an Application in Bug Tracking. In: ODBASE'06(OTM Federated Conferences). 2006. <br/><br/>
[http://www.sciences.univ-nantes.fr/lina/atl/bibliography/BDA05 BDA2005]
	Didonet Del Fabro, M, Bézivin, J, Jouault, F, and Valduriez, P : Applying Generic Model Management to Data Mapping. In: Proceedings of Bases de Données Avancées (BDA05), 17-20 october 2005, Saint-Malo, France.

[http://www.eclipse.org/gmt/amw/publication.php Complete list of publications related to AMW]

== Downloads  ==

The AMW project provides an Eclipse plugin to create weaving models and to compose metamodel extensions. <br> The plugin can be downloaded in the [http://www.eclipse.org/gmt/amw/download/ AMW Download Page]. <br> A set of application scenarios is available at [http://www.eclipse.org/gmt/amw/examples/ AMW Examples]. There are examples of weaving models, metamodel extensions, weaving models generated automatically through matching transformations, [[AM3 Ant Tasks]], higher-order transformations that take a weaving model and that produce model transformations, etc. These examples are sorted in different categories. 

<br> 

The anonymous SVN URL of AMW repository is ''http://dev.eclipse.org/svnroot/modeling/org.eclipse.gmt.amw'' , web access is [http://dev.eclipse.org/viewsvn/index.cgi/?root=Modeling_AMW http://dev.eclipse.org/viewsvn/index.cgi/?root=Modeling_AMW] .<br>

==See Also==
===[[AMW FAQ]]===
===Others===
[[AMW Wish List]]<br/><br/>
[[AM3]], The <b>ATLAS MegaModel Management</b> Eclipse wiki page<br/><br/>
[http://www.eclipse.org/gmt/am3 AM3], The <b>ATLAS MegaModel Management</b> project's Eclipse homepage<br/><br/>
[http://www.eclipse.org/m2m/atl ATL], The <b>ATLAS Transformation Language</b> project's Eclipse homepage<br/><br/>
[[ATL]], The <b>ATLAS Transformation Language</b> Eclipse wiki page<br/><br/>
[http://www.sciences.univ-nantes.fr/lina/atl/ ATL], The <b>ATL</b> homepage<br/><br/>

[[Category:Modeling]]
[[Category:MDD]]
[[Category:GMT]]
[[Category:AMMA]]
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