Annexes are not converted into the xml file.

[etj]

• Annexes are not converted into the xml file.
  They should be listed as online resources too, named "Annex"

"annex": {
    "references": [
      {
        "url": "https://github.com/geosolutions-it/iso19139_mapx_converter/wiki"
      },
      {
        "url": "https://datacore.unepgrid.ch/geonetwork/srv/eng/csw?SERVICE=CSW&VERSION=2.0.2&outputSchema=http://www.isotc211.org/2005/gmd&outputFormat=application/xml&REQUEST=GetRecordById&ID=2055b625-61f9-4bc6-9809-33b402e7935c"
      }
    ]
  },