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:content {:text "(c) the automated generation of migration tools by means of model transformations. "},
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:content {:text "the proposed process is also applied to manage the evolution of systems which have been developed with WebML, a modeling language which has been employed on full scale projects and is widely used in commercial enterprises"},
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:content {:text "even though each phase of the proposed process relies on techniques already available in other application domains, their integration and adaptation in a comprehensive modelbased approach to support Web application evolutions represents the main novelty of the paper"},
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:content {:text "several assets might not be directly reflected in the models, such as the content stored in persistent back-ends and those artifacts which are obtained via manual customizations (as outlined by the gray boxes in Fig. 1b)."},
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:content {:text "(a) the detection of model changes by means of model comparison techniques,"},
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:content {:text "(c) the automated generation of migration tools by means of model transformations. "},
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:content {:text "adaptation must necessarily consider the technological assets and the architecture of the final system that cannot be generalized."},
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:content {:text " it relies on a metamodel independent matching algorithm and can be used for differencing models conforming to any modeling language."},
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:content {:text "The beContent metamodel provides also a built-in support for RSS (Really Simple Syndication): the metaclass Channel is provided to define RSS channels and for each of them to specify the corresponding data source"},
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:content {:text "Table 1 Fragment of the change classification of beContent models"},
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:content {:text "Modifying this reference means adding or removing new contents in the handler and might require the template to be consistently adapted, i.e., to include or remove the correct tags which are depending on the data to be presented."},
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:content {:text "Changing properties of a content,"},
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:content {:text "So far, we have described the different ways a beContent model can be modified and discussed the countermeasures necessary to adapt the system accordingly."},
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:content {:text "EMF Compare and customizing its matching algorithm with ECL"},
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:content {:text "Even though such detected differences are correct from a structural point of view, very likely they do not reflect the intentions of the modeler."},
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:content {:text "state-based differencing approaches detect evolutions by comparing two snapshots of application models at selected development times."},
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:content {:text "According to this rule, two custom entities match when they are similarly named or when they are involved in a split operation."},
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:content {:text " In the following, the generation of the adaptations will be illustrated for both data and graphical templates for the LAMP platform. "},
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:content {:text "Whenever the structure part of a model is modified, the adaptation must account for the evolution of the schema and the migration of the existing data."},
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:content {:text " different SQL queries must be generated to consistently manage this operation according to the data change classification summarized in the upper part of Table 1."},
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:content {:text "structure model changes imply the generation of SQL queries to update the database schema, and to migrate the already stored data"},
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:content {:text " the deletion of data entities is managed by the lines 1–15 in Listing 3: it produces the SQL queries in the lines 1–5 in Listing 4 to deal with the deletion of the data entity Picture, as represented in the difference model in Fig. 18 by the DeletedCustomEntity element"},
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:content {:text "employer table since it has a column which refers to tuples of the table picture."},
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:content {:text "The existing queries to retrieve the appropriate data for page contents are generated as relying on the structure model definition in a beContent model. Therefore, whenever the structure concern is manipulated, the corresponding queries are automatically and consistently updated."},
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:content {:text "tate-based techniques are adopted as in our case, which required an additional tuning by means of ECL"},
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:content {:text "Unfortunately, it cannot be as accurate as in the previous case since the adaptation has to be manually performed by the designer. Nevertheless, interesting documents can be generated to describe the kind of operations which the designer might consider during the management of the migration stage, as the fragment in Listing 5 which is directly generated from the difference model in Fig"},
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:content {:text " In order to keep the system in a valid and consistent state, regenerating it does not suffice because of a variety of aspects which are either subject to customization or are referring to information which has been created after deployment."},
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:content {:text "from automated tools to prescriptions which can help the designer to consistently evolve the affected assets. "},
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:content {:text "differencing, data schema evolution, and coupled evolution"},
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:content {:text "The techniques presented here have been validated using the beContent metamodel which permits the declarative specification of Web applications generated by means of automated transformations."},
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:content {:text "By differencing beContent models, migration routines are obtained through model-to-code transformations whenever exact adaptations were possible, otherwise in order to re-establish the system consistency a migration recipe is proposed"},
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:content {:text "to better clarify the generality of the proposed technique an outline is provided of the needed steps to implement the same evolution support for WebML-based applications"},
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:extra {:page 1}}
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