diff --git a/umap/static/umap/js/modules/schema.js b/umap/static/umap/js/modules/schema.js
index 9b95b7d6..9602628f 100644
--- a/umap/static/umap/js/modules/schema.js
+++ b/umap/static/umap/js/modules/schema.js
@@ -1,22 +1,40 @@
 import { translate } from './i18n.js'
 
-// Possible impacts
-// ['ui', 'data', 'limit-bounds', 'datalayer-index', 'remote-data', 'background' 'sync']
+/**
+ * This SCHEMA defines metadata about properties.
+ *
+ * This is here in order to have a centered place where all properties are specified.
+ *
+ * Each property defines:
+ *
+ * - `type`:        The type of the data
+ * - `impacts`:     A list of impacts than happen when this property is updated, among
+ *                  'ui', 'data', 'limit-bounds', 'datalayer-index', 'remote-data',
+ *                  'background' 'sync'.
+ * - `belongsTo`:   A list of conceptual objects this property belongs to, among
+ *                  'map', 'feature', 'datalayer'.
+ *
+ * - Extra keys are being passed to the FormBuilder automatically.
+ */
 
 // This is sorted alphabetically
 export const SCHEMA = {
   browsable: {
-    impacts: ['ui'],
     type: Boolean,
+    impacts: ['ui'],
+    belongsTo: ['datalayer'],
   },
   captionBar: {
     type: Boolean,
     impacts: ['ui'],
+    belongsTo: ['map'],
     label: translate('Do you want to display a caption bar?'),
     default: false,
   },
   captionControl: {
     type: Boolean,
+    impacts: ['ui'],
+    belongsTo: ['map'],
     nullable: true,
     label: translate('Display the caption control'),
     default: true,
@@ -24,12 +42,14 @@ export const SCHEMA = {
   captionMenus: {
     type: Boolean,
     impacts: ['ui'],
+    belongsTo: ['map'],
     label: translate('Do you want to display caption menus?'),
     default: true,
   },
   color: {
     type: String,
     impacts: ['data'],
+    belongsTo: ['map', 'datalayer', 'feature'],
     handler: 'ColorPicker',
     label: translate('color'),
     helpEntries: 'colorValue',
@@ -39,14 +59,17 @@ export const SCHEMA = {
   choropleth: {
     type: Object,
     impacts: ['data'],
+    belongsTo: ['datalayer'],
   },
   cluster: {
     type: Object,
     impacts: ['data'],
+    belongsTo: ['datalayer'],
   },
   dashArray: {
     type: String,
     impacts: ['data'],
+    belongsTo: ['map', 'datalayer'],
     label: translate('dash array'),
     helpEntries: 'dashArray',
     inheritable: true,
@@ -54,6 +77,7 @@ export const SCHEMA = {
   datalayersControl: {
     type: Boolean,
     impacts: ['ui'],
+    belongsTo: ['map'],
     nullable: true,
     handler: 'DataLayersControl',
     label: translate('Display the data layers control'),
@@ -62,6 +86,7 @@ export const SCHEMA = {
   defaultView: {
     type: String,
     impacts: [], // no need to update the ui, only useful when loading the map
+    belongsTo: ['map'],
     label: translate('Default view'),
     choices: [
       ['center', translate('Saved center and zoom')],
@@ -74,27 +99,32 @@ export const SCHEMA = {
   description: {
     type: 'Text',
     impacts: ['ui'],
+    belongsTo: ['map', 'datalayer'],
     label: translate('description'),
     helpEntries: 'textFormatting',
   },
   displayOnLoad: {
     type: Boolean,
     impacts: [],
+    belongsTo: ['datalayer'], // XXX ?
   },
   displayPopupFooter: {
     type: Boolean,
     impacts: ['ui'],
+    belongsTo: ['map'], // XXX ?
     label: translate('Do you want to display popup footer?'),
     default: false,
   },
   easing: {
     type: Boolean,
     impacts: [],
+    belongsTo: ['feature'], // XXX ?
     default: false,
   },
   editinosmControl: {
     type: Boolean,
     impacts: ['ui'],
+    belongsTo: ['map'],
     nullable: true,
     label: translate('Display the control to open OpenStreetMap editor'),
     default: null,
@@ -102,6 +132,7 @@ export const SCHEMA = {
   embedControl: {
     type: Boolean,
     impacts: ['ui'],
+    belongsTo: ['map'],
     nullable: true,
     label: translate('Display the embed control'),
     default: true,
@@ -109,10 +140,12 @@ export const SCHEMA = {
   facetKey: {
     type: String,
     impacts: ['ui'],
+    belongsTo: ['datalayer'],
   },
   fill: {
     type: Boolean,
     impacts: ['data'],
+    belongsTo: ['map', 'datalayer', 'feature'],
     label: translate('fill'),
     helpEntries: 'fill',
     inheritable: true,
@@ -121,6 +154,7 @@ export const SCHEMA = {
   fillColor: {
     type: String,
     impacts: ['data'],
+    belongsTo: ['map', 'datalayer', 'feature'],
     handler: 'ColorPicker',
     label: translate('fill color'),
     helpEntries: 'fillColor',
@@ -129,6 +163,7 @@ export const SCHEMA = {
   fillOpacity: {
     type: Number,
     impacts: ['data'],
+    belongsTo: ['map', 'datalayer', 'feature'],
     min: 0.1,
     max: 1,
     step: 0.1,
@@ -139,16 +174,19 @@ export const SCHEMA = {
   filterKey: {
     type: String,
     impacts: [],
+    belongsTo: ['map', 'datalayer', 'feature'], // XXX ?
   },
   fromZoom: {
     type: Number,
     impacts: [], // not needed
+    belongsTo: ['map'], // XXX ?
     label: translate('From zoom'),
     helpText: translate('Optional.'),
   },
   fullscreenControl: {
     type: Boolean,
     impacts: ['ui'],
+    belongsTo: ['map'],
     nullable: true,
     label: translate('Display the fullscreen control'),
     default: true,
@@ -156,10 +194,12 @@ export const SCHEMA = {
   heat: {
     type: Object,
     impacts: ['data'],
+    belongsTo: ['datalayer'],
   },
   iconClass: {
     type: String,
     impacts: ['data'],
+    belongsTo: ['map', 'datalayer', 'feature'],
     label: translate('Icon shape'),
     inheritable: true,
     choices: [
@@ -173,6 +213,7 @@ export const SCHEMA = {
   iconOpacity: {
     type: Number,
     impacts: ['data'],
+    belongsTo: ['map', 'datalayer', 'feature'],
     min: 0.1,
     max: 1,
     step: 0.1,
@@ -183,6 +224,7 @@ export const SCHEMA = {
   iconUrl: {
     type: String,
     impacts: ['data'],
+    belongsTo: ['map', 'datalayer', 'feature'],
     handler: 'IconUrl',
     label: translate('Icon symbol'),
     inheritable: true,
@@ -190,10 +232,12 @@ export const SCHEMA = {
   inCaption: {
     type: Boolean,
     impacts: ['ui'],
+    belongsTo: [], // XXX ?
   },
   interactive: {
     type: Boolean,
     impacts: ['data'],
+    belongsTo: ['map', 'datalayer', 'feature'],
     label: translate('Allow interactions'),
     helpEntries: 'interactive',
     inheritable: true,
@@ -202,6 +246,7 @@ export const SCHEMA = {
   labelDirection: {
     type: String,
     impacts: ['data'],
+    belongsTo: ['map', 'datalayer', 'feature'],
     label: translate('Label direction'),
     inheritable: true,
     choices: [
@@ -216,12 +261,14 @@ export const SCHEMA = {
   labelInteractive: {
     type: Boolean,
     impacts: ['data'],
+    belongsTo: ['map', 'datalayer', 'feature'],
     label: translate('Labels are clickable'),
     inheritable: true,
   },
   labelKey: {
     type: String,
     impacts: ['data'],
+    belongsTo: ['map', 'datalayer', 'feature'], // XXX ?
     helpEntries: 'labelKey',
     placeholder: translate('Default: name'),
     label: translate('Label key'),
@@ -230,50 +277,59 @@ export const SCHEMA = {
   licence: {
     type: String,
     impacts: ['ui'],
+    belongsTo: ['map', 'datalayer'], // XXX ?
     label: translate('licence'),
   },
   limitBounds: {
     type: Object,
     impacts: ['limit-bounds'],
+    belongsTo: ['map'],
   },
   locateControl: {
     type: Boolean,
     impacts: ['ui'],
+    belongsTo: ['map'],
     nullable: true,
     label: translate('Display the locate control'),
   },
   longCredit: {
     type: 'Text',
     impacts: ['ui'],
+    belongsTo: ['map'],
     label: translate('Long credits'),
     helpEntries: ['longCredit', 'textFormatting'],
   },
   measureControl: {
     type: Boolean,
     impacts: ['ui'],
+    belongsTo: ['map'],
     nullable: true,
     label: translate('Display the measure control'),
   },
   miniMap: {
     type: Boolean,
     impacts: ['ui'],
+    belongsTo: ['map'],
     label: translate('Do you want to display a minimap?'),
     default: false,
   },
   moreControl: {
     type: Boolean,
     impacts: ['ui'],
+    belongsTo: ['map'],
     label: translate('Do you want to display the «more» control?'),
     default: true,
   },
   name: {
     type: String,
     impacts: ['ui', 'data'],
+    belongsTo: ['map', 'datalayer', 'feature'],
     label: translate('name'),
   },
   onLoadPanel: {
     type: String,
     impacts: [], // This is what happens during the map instantiation
+    belongsTo: ['map'],
     label: translate('Do you want to display a panel on load?'),
     choices: [
       ['none', translate('None')],
@@ -287,6 +343,7 @@ export const SCHEMA = {
   opacity: {
     type: Number,
     impacts: ['data'],
+    belongsTo: ['map', 'datalayer', 'feature'],
     min: 0.1,
     max: 1,
     step: 0.1,
@@ -296,6 +353,8 @@ export const SCHEMA = {
   },
   outlink: {
     type: String,
+    impacts: ['data'],
+    belongsTo: ['feature'],
     label: translate('Link to…'),
     helpEntries: 'outlink',
     placeholder: 'http://...',
@@ -303,7 +362,8 @@ export const SCHEMA = {
   },
   outlinkTarget: {
     type: String,
-    impacts: [],
+    impacts: ['data'],
+    belongsTo: ['feature'],
     label: translate('Open link in…'),
     inheritable: true,
     default: 'blank',
@@ -316,22 +376,26 @@ export const SCHEMA = {
   overlay: {
     type: Object,
     impacts: ['background'],
+    belongsTo: ['map'],
   },
   permanentCredit: {
     type: 'Text',
     impacts: ['ui'],
+    belongsTo: ['map'],
     label: translate('Permanent credits'),
     helpEntries: ['permanentCredit', 'textFormatting'],
   },
   permanentCreditBackground: {
     type: Boolean,
     impacts: ['ui'],
+    belongsTo: ['map'],
     label: translate('Permanent credits background'),
     default: true,
   },
   popupContentTemplate: {
     type: 'Text',
     impacts: [], // not needed
+    belongsTo: ['map', 'datalayer', 'feature'],
     label: translate('Popup content template'),
     helpEntries: ['dynamicProperties', 'textFormatting'],
     placeholder: '# {name}',
@@ -341,6 +405,7 @@ export const SCHEMA = {
   popupShape: {
     type: String,
     impacts: [], // not needed
+    belongsTo: ['map', 'datalayer', 'feature'], // XXX ?
     label: translate('Popup shape'),
     inheritable: true,
     choices: [
@@ -353,6 +418,7 @@ export const SCHEMA = {
   popupTemplate: {
     type: String,
     impacts: [], // not needed
+    belongsTo: ['map', 'datalayer', 'feature'], // XXX ?
     label: translate('Popup content style'),
     inheritable: true,
     choices: [
@@ -367,21 +433,25 @@ export const SCHEMA = {
   remoteData: {
     type: Object,
     impacts: ['remote-data'],
+    belongsTo: ['datalayer'],
   },
   scaleControl: {
     type: Boolean,
     impacts: ['ui'],
+    belongsTo: ['map'],
     label: translate('Do you want to display the scale control?'),
     default: true,
   },
   scrollWheelZoom: {
     type: Boolean,
     impacts: ['ui'],
+    belongsTo: ['map'],
     label: translate('Allow scroll wheel zoom?'),
   },
   searchControl: {
     type: Boolean,
     impacts: ['ui'],
+    belongsTo: ['map'],
     nullable: true,
     label: translate('Display the search control'),
     default: true,
@@ -389,28 +459,33 @@ export const SCHEMA = {
   shortCredit: {
     type: String,
     impacts: ['ui'],
+    belongsTo: ['map'],
     label: translate('Short credits'),
     helpEntries: ['shortCredit', 'textFormatting'],
   },
   showLabel: {
     type: Boolean,
     impacts: ['data'],
+    belongsTo: ['map', 'datalayer', 'feature'],
     nullable: true,
     label: translate('Display label'),
     inheritable: true,
     default: false,
   },
   slideshow: {
+    belongsTo: ['map'],
     type: Object,
     impacts: ['ui'],
   },
   slugKey: {
     type: String,
     impacts: [],
+    belongsTo: ['map', 'datalayer', 'feature'], // XXX ?
   },
   smoothFactor: {
     type: Number,
     impacts: ['data'],
+    belongsTo: ['map', 'datalayer', 'feature'],
     min: 0,
     max: 10,
     step: 0.5,
@@ -422,16 +497,19 @@ export const SCHEMA = {
   sortKey: {
     type: String,
     impacts: ['datalayer-index', 'data'],
+    belongsTo: ['map', 'datalayer'],
   },
   starControl: {
     type: Boolean,
     impacts: ['ui'],
+    belongsTo: ['map'],
     nullable: true,
     label: translate('Display the star map button'),
   },
   stroke: {
     type: Boolean,
     impacts: ['data'],
+    belongsTo: ['map', 'datalayer', 'feature'],
     label: translate('stroke'),
     helpEntries: 'stroke',
     inheritable: true,
@@ -440,6 +518,7 @@ export const SCHEMA = {
   syncEnabled: {
     type: Boolean,
     impacts: ['sync', 'ui'],
+    belongsTo: ['map'],
     label: translate('Enable real-time collaboration'),
     helpEntries: 'sync',
     default: false,
@@ -447,26 +526,31 @@ export const SCHEMA = {
   tilelayer: {
     type: Object,
     impacts: ['background'],
+    belongsTo: ['map'],
   },
   tilelayersControl: {
     type: Boolean,
     impacts: ['ui'],
+    belongsTo: ['map'],
     nullable: true,
     label: translate('Display the tile layers control'),
   },
   toZoom: {
     type: Number,
     impacts: [], // not needed
+    belongsTo: ['map'],
     label: translate('To zoom'),
     helpText: translate('Optional.'),
   },
   type: {
     type: 'String',
     impacts: ['data'],
+    belongsTo: [], // XXX ?
   },
   weight: {
     type: Number,
     impacts: ['data'],
+    belongsTo: ['feature'], // XXX ?,
     min: 1,
     max: 20,
     step: 1,
@@ -477,10 +561,12 @@ export const SCHEMA = {
   zoom: {
     type: Number,
     impacts: [], // default zoom, doesn't need to be updated
+    belongsTo: ['map'],
   },
   zoomControl: {
     type: Boolean,
     impacts: ['ui'],
+    belongsTo: ['map'],
     nullable: true,
     label: translate('Display the zoom control'),
     default: true,
@@ -488,6 +574,7 @@ export const SCHEMA = {
   zoomTo: {
     type: Number,
     impacts: [], // not need to update the view
+    belongsTo: ['map'],
     placeholder: translate('Inherit'),
     helpEntries: 'zoomTo',
     label: translate('Default zoom level'),