(applicable to version 9.6, extract of the official documentation available online)
When you export a Requirements Interchange Format package, the data that is included in the selected definition is copied to an XML file. Data locks are applied to the local data as prescribed by the definition. The XML file is called a Requirements Interchange Format package.
You must have the required permissions to partition data, and modify access to the project. Make sure the project and the modules in the definition you want to export are not open.
Note: When you export a package, all public views that you can access in the modules in the definition are included in the package.
Note: If you want to import then the ReqIF file into Capella, please make sure to export also necessary modules containing exported requirements.