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For Developers:

There are really two different kinds of developers. Those that want to embed Daffodil into an application, and those who want to contribute to Daffodil itself. These are not mutually exclusive.

Embedding Daffodil in an Application

If you want to embed Daffodil into some other system so that you can parse data using DFDL schemas to describe the format, then you can develop in Java or in Scala. There are APIs for both.

• • Getting Daffodil
  • Javadoc for the Daffodil API
  • Scaladoc for the Daffodil API

Please also see Quick projects to get started contributing to Daffodil as there are some very cool projects that really just require you to use Daffodil from its API.

Developing Daffodil Itself

If you want to help in the development of Daffodil itself, then you will need to know or learn Scala, because that's what it is written in.

• • Getting Started for Developers

If you want a gradual introduction, please see Quick projects to get started contributing to Daffodil as there are some things there that are reasonable stepping stones to get your feet wet.