Check the parsley plugin merger

[opcoach]

In the parsley project, they generate a plugin.xml and then merge it into the plugin.

It could be interesting to see how it is done... Here the use case is a little bit different than just merge because if an emf.generated extension is already present with the same URI, it should be overridden. ...

Anyway should have a look on :

https://www.eclipse.org/emf-parsley/documentation.html#PluginXml

How the DSL handles the plugin.xml
If you specify any part in the DSL file, then the Parsley DSL will generate a plugin.xml_emfparsley_gen in the emfparsley-gen folder, in a directory named after the containing module. Then, the EMF Parsley builder will take care of merging the generated content with the plugin.xml in the root folder of the current project. If the plugin.xml does not exist it will create it. Subsequent changes to the DSL file will regenerate plugin.xml_emfparsley_gen and the builder will merge it with plugin.xml. The merging will overwrite in the plugin.xml only the elements that are specified in the DSL. Any other elements in the plugin.xml will not be touched, so you can also add other extension points manually in the plugin.xml.
This merging takes place ONLY if your project has the EMF Parsley builder nature. Since version 0.6.1 this nature is automatically applied to the projects created with our wizard. In existing projects, you have to enable the nature yourself by right-clicking on the project, then "Configure" and then "Enable EMF Parsley builder.
Note that this merging will not consider possible removed part sections in the DSL file. The merging relies on the id, so if you change the id, e.g., the viewid, in the DSL file, then you will end up with two extension points in the plugin.xml. Thus, in general, if you removed a part section from the DSL file, or if you rename an id in a part section, please make sure you manually modify the plugin.xml accordingly. The easiest way is to select to the files, and use the context menu "Compare With" => "Each Other". This way, you will soon detect the changes that have to be manually applied.