{"_type" :  "GIS-CENTROIDS",
  "platform" : {"type": "GeoServer",
    "ogc_links" : [
      {"wms": ""},{"wfs": ""},{"csw": ""}
    ],
    "is-coordinates" : {}
  },

  "centroids_layer" : {"<layer_info>":".."},

  "cross_filtering_layers" : [
    {"<layer info>" :  "..",
      "link" : [
        {"source_field" : "..",
          "target_field" : "..",
          "target_layer_name" : ""}
      ]}
  ]
}