E3 contains tools that allow transforming any object or set of objects from an application into a user library. The concept of user libraries (called ElipseX) comes from object-oriented programming languages, where several components can be shared among projects without the need to developed each object again. Using libraries in E3 is highly recommended, due to performance improvements they bring. Some advantages of ElipseX Libraries are:

•Reusing source code

•Reducing tests during development

•Creating default interfaces for developed objects

•Reducing development time of new projects

•Protecting project's content

•Ranking objects

Using Libraries is recommended in most applications.

Object libraries