Test xml files are added, string is built for each file
and namespaces are handled.

Change-Id: I0ab799ca5c9de7311ccca2a6033a96e02598064f
Reviewed-on: https://gerrit.libreoffice.org/25468Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Michael Meeks <michael.meeks@collabora.com>