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Metadata for SDK

Bundles and exe

  • Each bundle will get a corresponding Installable Unit.
  • Each bundle with specific configuration needs (e.g start level) will have an installable unit fragment. A default fragment will provide configuration for all other bundles.
  • The eclipse.exe will have a corresponding installable unit.


The following mapping between features and IUs is kept for backward compatibility and consumability reasons. However in the future dependencies should always be expressed on the IUs representing bundles.

  • Each feature is currently mapped to an installable unit (marked as group). Each IU depends on the IUs representing the bundles and the IUs representing the features.
  • Each feature is mapped to a recommendation (an installable unit containing recommendation information). This recommendation will be used to indicate which version of an IU should be used. The recommendation will only talk about things that are actually being delivered by the feature from which the IU is being generated.

The installation of a recommendation installable unit will not cause the installation of any of the entity referred to from the list of recommendation. Each recommendation IU will provide as a capability the "requirements" being refined, thus allowing recommendation IUs to be used when installing an IU.

  • The two IUs will evolve on different time line since the content of the group may not change whereas new versions of an IU are being produced.

For example the list of plugins listed in the version 3.2 and 3.2.1 of the RCP feature is the same. The only thing that changed is the version to be used, here represented by the recommendation IU. Therefore in this scenario the recommendation IU will be updated.


Platform Group 3.2

 org.eclipse.rcp (group)

Platform recommendation 3.2.0.v2006

 provide recommendation capability for the the platform group
 provide recommendation capability for org.eclipse.core.resources
 provide recommendation capability for org.eclipse.core.variables
 provide recommendation capability for org.eclipse.ui
 <touchpoint data>
   list of recommendations
 </touchpoint data>  

SDK Group 3.2

 org.eclipse.platform (group)
 org.eclipse.pde (group)

SDK Recommendation 3.2.0.v2006

 provide recommendation capability for SDK group
 <touchpoint data>
   <list of recommendations/>
   <install root/>
 </touchpoint data>

SDK Recommendation 3.2.1.v2006

 provide recommendation capability for SDK group
 <touchpoint data>
   <list of recommendations/>
   <install root/>
 </touchpoint data>


  • What does a user install?
  • If an IU is being installed and does not change but the recommendation that has been picked at install time changes, what should be done? How do we detect updates?
  • Most of this information is of a meta level. How does the agent recognize the difference between the base and the meta level? The meta level introduces dependencies that should not be used when sorting the IUs for processing.
  • Are we trying too hard to make everything an IU when we say that a recommendation is an IU? It operates on the system before it is ever installed, and it typically does not get installed completely. And a user would probably never view it as an installable entity, but rather something that guides the install.

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