How to convert XSD to Ecore (EMF)

That's what worked for me:

• New -> Project...
• Eclipse Modeling Framework -> EMF Project
• Model Importers: XML Schema
• Model URIs: [Select xsd-File]

To revalidate the .ecore-File when xsd has changed:

• Right-Click on .genmodel-File
• Reload...

If you do not want to create a new MDT project every time you want to import a schema as ECore model then there is also another way to do this:

• New -> EMF Generator Model (in "Eclipse Modelling Framework")
• Press Next
• Select folder and specify filename (has to have the extension "genmodel")
• Press Next
• Select "XML Schema" as model importer
• Press Next
• Select URI to your XSD
• (Optionally, select tick box "Create XML Schema to Ecore Map" if you want to generate a .xsd2ecore map file)
• Press Next
• Select all desired root packages
• Press Finish