WYSIWYG created external links do not import properly

Import test.xml which contains a page with some text and an external link created by highlighting text and clicking the link button in the MW WYSIWYG editor.

MW source code format is [[external url/ display text]]:

Agile Values ([Http://agilemanifesto.org/ Agile Manifesto])

XWiki doesn't know how to understand this and creates a malformed link:

Agile Values ([[Main.Http://agilemanifesto\.org/_Agile_Manifesto]])