Bug ID: 62111
           Summary: Importing XML dumps should validate that the target
                    wiki has the same namespaces as the pages being
           Product: MediaWiki
           Version: 1.23-git
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: Unprioritized
         Component: Export/Import
        Depends on: 62109
       Web browser: ---
   Mobile Platform: ---

When one imports a XML dump from other wiki, and it contains pages in custom
namespaces, if those custom namespaces doesn't exist on the target wiki, it
will end in pages imported in the main namespace (with the original namespace
in the title, but not without being in that namespace, since it doesn't exist).
That can be confusing, and if a lot of pages are being imported with that
problem, it would be a pain to fix the issue.

It would be good to add some validation when importing the dump, based on the
list of namespaces already present on the header of the dump: If a page in the
dump is in a namespace not present in the target wiki, abort the import.

Things we should consider:
* Adding a checkbox in Special:Import, and an option in importDump.php to
ignore namespace validation: When marked, it should generate a warning at the
end, but proceed with the import of such pages. Otherwise, abort the import
when a page of a not-existing namespace is found.
* Don't validate the list of namespaces that are in the header of the dump,
just when each page is being imported. For example, the original wiki may have
custom namespaces not present in the target wiki, but the dump only contains
known namespaces (eg: namespace 0), in this case it shouldn't abort the import

A nice addition would be to allow mapping namespaces from the dump to other
namespaces on the target wiki (bug 41969)

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