Eclipse CDT spell-check in XML (non-C++) files

Question

In Eclipse Oxygen with CDT I can configure spell checking for most file types under

Preferences > General > Editors > Text Editors > Spelling

However for XML files, which are apparently opened in the "Structured Text Editor", I can not find such an option.

Is this hidden somewhere or covered by a good plug-in?

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Update

The user guide mentions spell-checking for "Structured Text Editor", but that does not match the actual UI; neither "Window > Preferences > Spell Check" exists as described nor "Edit > Spell Check":

Answer 1

EDIT: Seems to be a known bug / feature request:

• https://bugs.eclipse.org/bugs/show_bug.cgi?id=185695
• https://bugs.eclipse.org/bugs/show_bug.cgi?id=521658

Possibly installing Java tooling on top would fix.

NOT HELPING:

The eclipse help has an article on this: http://help.eclipse.org/kepler/index.jsp?topic=%2Forg.eclipse.wst.sse.doc.user%2Ftopics%2Ftsrcedt010.html

Also Eclipse should have an "Open With" context menu entry by which you could open as a text file, and have spell check.