Import/ Export of articles and issues with geospatial metadata

[tomniers]

The export of articles and issues in OJS (Tools->Import/Export->e.g. Native XML Plugin) does not work with geospatial metadata. The export still works, but either the geospatial metadata are not integrated, or they cannot be reused in the subsequent import. At least they are not displayed after a new import and are not available in the database.