How can I make sure Eclipse automatically detects XML files?
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What's going?

My Eclipse does not give me the XML view for XML files.
Plus in the package explorer XML files do not get highlighted as those.

When I open the XML file, Eclipse opens the normal text view.
Also if files are obviously written in XML, and they have an .xml ending.

What I want is, that Eclipse gives me the tab switcher on the bottom of the editor.
Usually used to switch between an XML file's Design/Source view, with XML specific highlighting.

How can I make sure that Eclipse automatically detects XML files in future?

I'm running Eclipse version 3.7.0 on Linux Mint.

Thanks for any attempts to help!