diff --git a/src/opengeodeweb_viewer/rpc/generic/schemas/deregister.json b/src/opengeodeweb_viewer/rpc/generic/schemas/deregister.json
index 61715c4..70c1ba0 100644
--- a/src/opengeodeweb_viewer/rpc/generic/schemas/deregister.json
+++ b/src/opengeodeweb_viewer/rpc/generic/schemas/deregister.json
@@ -4,10 +4,15 @@
   "properties": {
     "viewer_object": {
       "type": "string",
-      "enum": ["mesh", "model"]
+      "minLength": 1,
+      "enum": [
+        "mesh",
+        "model"
+      ]
     },
     "id": {
-      "type": "string"
+      "type": "string",
+      "minLength": 1
     }
   },
   "required": [
diff --git a/src/opengeodeweb_viewer/rpc/generic/schemas/register.json b/src/opengeodeweb_viewer/rpc/generic/schemas/register.json
index 93a5ac2..26187d9 100644
--- a/src/opengeodeweb_viewer/rpc/generic/schemas/register.json
+++ b/src/opengeodeweb_viewer/rpc/generic/schemas/register.json
@@ -4,13 +4,19 @@
   "properties": {
     "viewer_object": {
       "type": "string",
-      "enum": ["mesh", "model"]
+      "minLength": 1,
+      "enum": [
+        "mesh",
+        "model"
+      ]
     },
     "id": {
-      "type": "string"
+      "type": "string",
+      "minLength": 1
     },
     "file_name": {
-      "type": "string"
+      "type": "string",
+      "minLength": 1
     }
   },
   "required": [
diff --git a/src/opengeodeweb_viewer/rpc/mesh/edges/schemas/color.json b/src/opengeodeweb_viewer/rpc/mesh/edges/schemas/color.json
index 720d50b..b1c5e72 100644
--- a/src/opengeodeweb_viewer/rpc/mesh/edges/schemas/color.json
+++ b/src/opengeodeweb_viewer/rpc/mesh/edges/schemas/color.json
@@ -3,7 +3,8 @@
   "type": "object",
   "properties": {
     "id": {
-      "type": "string"
+      "type": "string",
+      "minLength": 1
     },
     "color": {
       "type": "object",
diff --git a/src/opengeodeweb_viewer/rpc/mesh/edges/schemas/size.json b/src/opengeodeweb_viewer/rpc/mesh/edges/schemas/size.json
index d403c33..47eefd0 100644
--- a/src/opengeodeweb_viewer/rpc/mesh/edges/schemas/size.json
+++ b/src/opengeodeweb_viewer/rpc/mesh/edges/schemas/size.json
@@ -3,7 +3,8 @@
   "type": "object",
   "properties": {
     "id": {
-      "type": "string"
+      "type": "string",
+      "minLength": 1
     },
     "size": {
       "type": "integer"
diff --git a/src/opengeodeweb_viewer/rpc/mesh/edges/schemas/vertex_attribute.json b/src/opengeodeweb_viewer/rpc/mesh/edges/schemas/vertex_attribute.json
index 05368b8..9eb5de6 100644
--- a/src/opengeodeweb_viewer/rpc/mesh/edges/schemas/vertex_attribute.json
+++ b/src/opengeodeweb_viewer/rpc/mesh/edges/schemas/vertex_attribute.json
@@ -3,10 +3,12 @@
   "type": "object",
   "properties": {
     "id": {
-      "type": "string"
+      "type": "string",
+      "minLength": 1
     },
     "name": {
-      "type": "string"
+      "type": "string",
+      "minLength": 1
     }
   },
   "required": [
diff --git a/src/opengeodeweb_viewer/rpc/mesh/edges/schemas/visibility.json b/src/opengeodeweb_viewer/rpc/mesh/edges/schemas/visibility.json
index 4b2368d..e699d92 100644
--- a/src/opengeodeweb_viewer/rpc/mesh/edges/schemas/visibility.json
+++ b/src/opengeodeweb_viewer/rpc/mesh/edges/schemas/visibility.json
@@ -3,7 +3,8 @@
   "type": "object",
   "properties": {
     "id": {
-      "type": "string"
+      "type": "string",
+      "minLength": 1
     },
     "visibility": {
       "type": "boolean"
diff --git a/src/opengeodeweb_viewer/rpc/mesh/points/schemas/color.json b/src/opengeodeweb_viewer/rpc/mesh/points/schemas/color.json
index 720d50b..b1c5e72 100644
--- a/src/opengeodeweb_viewer/rpc/mesh/points/schemas/color.json
+++ b/src/opengeodeweb_viewer/rpc/mesh/points/schemas/color.json
@@ -3,7 +3,8 @@
   "type": "object",
   "properties": {
     "id": {
-      "type": "string"
+      "type": "string",
+      "minLength": 1
     },
     "color": {
       "type": "object",
diff --git a/src/opengeodeweb_viewer/rpc/mesh/points/schemas/size.json b/src/opengeodeweb_viewer/rpc/mesh/points/schemas/size.json
index b699204..75a8889 100644
--- a/src/opengeodeweb_viewer/rpc/mesh/points/schemas/size.json
+++ b/src/opengeodeweb_viewer/rpc/mesh/points/schemas/size.json
@@ -3,7 +3,8 @@
   "type": "object",
   "properties": {
     "id": {
-      "type": "string"
+      "type": "string",
+      "minLength": 1
     },
     "size": {
       "type": "number"
diff --git a/src/opengeodeweb_viewer/rpc/mesh/points/schemas/vertex_attribute.json b/src/opengeodeweb_viewer/rpc/mesh/points/schemas/vertex_attribute.json
index 05368b8..9eb5de6 100644
--- a/src/opengeodeweb_viewer/rpc/mesh/points/schemas/vertex_attribute.json
+++ b/src/opengeodeweb_viewer/rpc/mesh/points/schemas/vertex_attribute.json
@@ -3,10 +3,12 @@
   "type": "object",
   "properties": {
     "id": {
-      "type": "string"
+      "type": "string",
+      "minLength": 1
     },
     "name": {
-      "type": "string"
+      "type": "string",
+      "minLength": 1
     }
   },
   "required": [
diff --git a/src/opengeodeweb_viewer/rpc/mesh/points/schemas/visibility.json b/src/opengeodeweb_viewer/rpc/mesh/points/schemas/visibility.json
index 4b2368d..e699d92 100644
--- a/src/opengeodeweb_viewer/rpc/mesh/points/schemas/visibility.json
+++ b/src/opengeodeweb_viewer/rpc/mesh/points/schemas/visibility.json
@@ -3,7 +3,8 @@
   "type": "object",
   "properties": {
     "id": {
-      "type": "string"
+      "type": "string",
+      "minLength": 1
     },
     "visibility": {
       "type": "boolean"
diff --git a/src/opengeodeweb_viewer/rpc/mesh/polygons/schemas/color.json b/src/opengeodeweb_viewer/rpc/mesh/polygons/schemas/color.json
index 720d50b..b1c5e72 100644
--- a/src/opengeodeweb_viewer/rpc/mesh/polygons/schemas/color.json
+++ b/src/opengeodeweb_viewer/rpc/mesh/polygons/schemas/color.json
@@ -3,7 +3,8 @@
   "type": "object",
   "properties": {
     "id": {
-      "type": "string"
+      "type": "string",
+      "minLength": 1
     },
     "color": {
       "type": "object",
diff --git a/src/opengeodeweb_viewer/rpc/mesh/polygons/schemas/polygon_attribute.json b/src/opengeodeweb_viewer/rpc/mesh/polygons/schemas/polygon_attribute.json
index cb6c23a..e301d6a 100644
--- a/src/opengeodeweb_viewer/rpc/mesh/polygons/schemas/polygon_attribute.json
+++ b/src/opengeodeweb_viewer/rpc/mesh/polygons/schemas/polygon_attribute.json
@@ -3,10 +3,12 @@
   "type": "object",
   "properties": {
     "id": {
-      "type": "string"
+      "type": "string",
+      "minLength": 1
     },
     "name": {
-      "type": "string"
+      "type": "string",
+      "minLength": 1
     }
   },
   "required": [
diff --git a/src/opengeodeweb_viewer/rpc/mesh/polygons/schemas/vertex_attribute.json b/src/opengeodeweb_viewer/rpc/mesh/polygons/schemas/vertex_attribute.json
index 05368b8..9eb5de6 100644
--- a/src/opengeodeweb_viewer/rpc/mesh/polygons/schemas/vertex_attribute.json
+++ b/src/opengeodeweb_viewer/rpc/mesh/polygons/schemas/vertex_attribute.json
@@ -3,10 +3,12 @@
   "type": "object",
   "properties": {
     "id": {
-      "type": "string"
+      "type": "string",
+      "minLength": 1
     },
     "name": {
-      "type": "string"
+      "type": "string",
+      "minLength": 1
     }
   },
   "required": [
diff --git a/src/opengeodeweb_viewer/rpc/mesh/polygons/schemas/visibility.json b/src/opengeodeweb_viewer/rpc/mesh/polygons/schemas/visibility.json
index 4b2368d..e699d92 100644
--- a/src/opengeodeweb_viewer/rpc/mesh/polygons/schemas/visibility.json
+++ b/src/opengeodeweb_viewer/rpc/mesh/polygons/schemas/visibility.json
@@ -3,7 +3,8 @@
   "type": "object",
   "properties": {
     "id": {
-      "type": "string"
+      "type": "string",
+      "minLength": 1
     },
     "visibility": {
       "type": "boolean"
diff --git a/src/opengeodeweb_viewer/rpc/mesh/polyhedrons/schemas/color.json b/src/opengeodeweb_viewer/rpc/mesh/polyhedrons/schemas/color.json
index 720d50b..b1c5e72 100644
--- a/src/opengeodeweb_viewer/rpc/mesh/polyhedrons/schemas/color.json
+++ b/src/opengeodeweb_viewer/rpc/mesh/polyhedrons/schemas/color.json
@@ -3,7 +3,8 @@
   "type": "object",
   "properties": {
     "id": {
-      "type": "string"
+      "type": "string",
+      "minLength": 1
     },
     "color": {
       "type": "object",
diff --git a/src/opengeodeweb_viewer/rpc/mesh/polyhedrons/schemas/polyhedron_attribute.json b/src/opengeodeweb_viewer/rpc/mesh/polyhedrons/schemas/polyhedron_attribute.json
index 6d3a1dd..6ee61a6 100644
--- a/src/opengeodeweb_viewer/rpc/mesh/polyhedrons/schemas/polyhedron_attribute.json
+++ b/src/opengeodeweb_viewer/rpc/mesh/polyhedrons/schemas/polyhedron_attribute.json
@@ -3,10 +3,12 @@
   "type": "object",
   "properties": {
     "id": {
-      "type": "string"
+      "type": "string",
+      "minLength": 1
     },
     "name": {
-      "type": "string"
+      "type": "string",
+      "minLength": 1
     }
   },
   "required": [
diff --git a/src/opengeodeweb_viewer/rpc/mesh/polyhedrons/schemas/vertex_attribute.json b/src/opengeodeweb_viewer/rpc/mesh/polyhedrons/schemas/vertex_attribute.json
index 05368b8..9eb5de6 100644
--- a/src/opengeodeweb_viewer/rpc/mesh/polyhedrons/schemas/vertex_attribute.json
+++ b/src/opengeodeweb_viewer/rpc/mesh/polyhedrons/schemas/vertex_attribute.json
@@ -3,10 +3,12 @@
   "type": "object",
   "properties": {
     "id": {
-      "type": "string"
+      "type": "string",
+      "minLength": 1
     },
     "name": {
-      "type": "string"
+      "type": "string",
+      "minLength": 1
     }
   },
   "required": [
diff --git a/src/opengeodeweb_viewer/rpc/mesh/polyhedrons/schemas/visibility.json b/src/opengeodeweb_viewer/rpc/mesh/polyhedrons/schemas/visibility.json
index 4b2368d..e699d92 100644
--- a/src/opengeodeweb_viewer/rpc/mesh/polyhedrons/schemas/visibility.json
+++ b/src/opengeodeweb_viewer/rpc/mesh/polyhedrons/schemas/visibility.json
@@ -3,7 +3,8 @@
   "type": "object",
   "properties": {
     "id": {
-      "type": "string"
+      "type": "string",
+      "minLength": 1
     },
     "visibility": {
       "type": "boolean"
diff --git a/src/opengeodeweb_viewer/rpc/mesh/schemas/apply_textures.json b/src/opengeodeweb_viewer/rpc/mesh/schemas/apply_textures.json
index e7fd44f..311384e 100644
--- a/src/opengeodeweb_viewer/rpc/mesh/schemas/apply_textures.json
+++ b/src/opengeodeweb_viewer/rpc/mesh/schemas/apply_textures.json
@@ -3,18 +3,21 @@
   "type": "object",
   "properties": {
     "id": {
-      "type": "string"
+      "type": "string",
+      "minLength": 1
     },
     "textures": {
       "type": "array",
-      "elements": {
+      "items": {
         "type": "object",
         "properties": {
           "texture_name": {
-            "type": "string"
+            "type": "string",
+            "minLength": 1
           },
           "texture_file_name": {
-            "type": "string"
+            "type": "string",
+            "minLength": 1
           }
         },
         "required": [
diff --git a/src/opengeodeweb_viewer/rpc/mesh/schemas/color.json b/src/opengeodeweb_viewer/rpc/mesh/schemas/color.json
index 35a5200..14b0386 100644
--- a/src/opengeodeweb_viewer/rpc/mesh/schemas/color.json
+++ b/src/opengeodeweb_viewer/rpc/mesh/schemas/color.json
@@ -3,10 +3,11 @@
   "type": "object",
   "properties": {
     "id": {
-      "type": "string"
+      "type": "string",
+      "minLength": 1
     },
     "color": {
-      "type": "object", 
+      "type": "object",
       "properties": {
         "r": {
           "type": "integer",
diff --git a/src/opengeodeweb_viewer/rpc/mesh/schemas/deregister.json b/src/opengeodeweb_viewer/rpc/mesh/schemas/deregister.json
index f87e93b..55b60b5 100644
--- a/src/opengeodeweb_viewer/rpc/mesh/schemas/deregister.json
+++ b/src/opengeodeweb_viewer/rpc/mesh/schemas/deregister.json
@@ -3,7 +3,8 @@
   "type": "object",
   "properties": {
     "id": {
-      "type": "string"
+      "type": "string",
+      "minLength": 1
     }
   },
   "required": [
diff --git a/src/opengeodeweb_viewer/rpc/mesh/schemas/opacity.json b/src/opengeodeweb_viewer/rpc/mesh/schemas/opacity.json
index 86eff6d..b9b3c54 100644
--- a/src/opengeodeweb_viewer/rpc/mesh/schemas/opacity.json
+++ b/src/opengeodeweb_viewer/rpc/mesh/schemas/opacity.json
@@ -3,7 +3,8 @@
   "type": "object",
   "properties": {
     "id": {
-      "type": "string"
+      "type": "string",
+      "minLength": 1
     },
     "opacity": {
       "type": "number",
diff --git a/src/opengeodeweb_viewer/rpc/mesh/schemas/register.json b/src/opengeodeweb_viewer/rpc/mesh/schemas/register.json
index 593d2b2..371e658 100644
--- a/src/opengeodeweb_viewer/rpc/mesh/schemas/register.json
+++ b/src/opengeodeweb_viewer/rpc/mesh/schemas/register.json
@@ -3,10 +3,12 @@
   "type": "object",
   "properties": {
     "id": {
-      "type": "string"
+      "type": "string",
+      "minLength": 1
     },
     "file_name": {
-      "type": "string"
+      "type": "string",
+      "minLength": 1
     }
   },
   "required": [
diff --git a/src/opengeodeweb_viewer/rpc/mesh/schemas/visibility.json b/src/opengeodeweb_viewer/rpc/mesh/schemas/visibility.json
index 4b2368d..e699d92 100644
--- a/src/opengeodeweb_viewer/rpc/mesh/schemas/visibility.json
+++ b/src/opengeodeweb_viewer/rpc/mesh/schemas/visibility.json
@@ -3,7 +3,8 @@
   "type": "object",
   "properties": {
     "id": {
-      "type": "string"
+      "type": "string",
+      "minLength": 1
     },
     "visibility": {
       "type": "boolean"
diff --git a/src/opengeodeweb_viewer/rpc/model/schemas/apply_textures.json b/src/opengeodeweb_viewer/rpc/model/schemas/apply_textures.json
index e7fd44f..311384e 100644
--- a/src/opengeodeweb_viewer/rpc/model/schemas/apply_textures.json
+++ b/src/opengeodeweb_viewer/rpc/model/schemas/apply_textures.json
@@ -3,18 +3,21 @@
   "type": "object",
   "properties": {
     "id": {
-      "type": "string"
+      "type": "string",
+      "minLength": 1
     },
     "textures": {
       "type": "array",
-      "elements": {
+      "items": {
         "type": "object",
         "properties": {
           "texture_name": {
-            "type": "string"
+            "type": "string",
+            "minLength": 1
           },
           "texture_file_name": {
-            "type": "string"
+            "type": "string",
+            "minLength": 1
           }
         },
         "required": [
diff --git a/src/opengeodeweb_viewer/rpc/model/schemas/deregister.json b/src/opengeodeweb_viewer/rpc/model/schemas/deregister.json
index f87e93b..55b60b5 100644
--- a/src/opengeodeweb_viewer/rpc/model/schemas/deregister.json
+++ b/src/opengeodeweb_viewer/rpc/model/schemas/deregister.json
@@ -3,7 +3,8 @@
   "type": "object",
   "properties": {
     "id": {
-      "type": "string"
+      "type": "string",
+      "minLength": 1
     }
   },
   "required": [
diff --git a/src/opengeodeweb_viewer/rpc/model/schemas/register.json b/src/opengeodeweb_viewer/rpc/model/schemas/register.json
index 593d2b2..371e658 100644
--- a/src/opengeodeweb_viewer/rpc/model/schemas/register.json
+++ b/src/opengeodeweb_viewer/rpc/model/schemas/register.json
@@ -3,10 +3,12 @@
   "type": "object",
   "properties": {
     "id": {
-      "type": "string"
+      "type": "string",
+      "minLength": 1
     },
     "file_name": {
-      "type": "string"
+      "type": "string",
+      "minLength": 1
     }
   },
   "required": [
diff --git a/src/opengeodeweb_viewer/rpc/model/schemas/set_components_color.json b/src/opengeodeweb_viewer/rpc/model/schemas/set_components_color.json
index aabecc8..3199667 100644
--- a/src/opengeodeweb_viewer/rpc/model/schemas/set_components_color.json
+++ b/src/opengeodeweb_viewer/rpc/model/schemas/set_components_color.json
@@ -3,7 +3,8 @@
   "type": "object",
   "properties": {
     "id": {
-      "type": "string"
+      "type": "string",
+      "minLength": 1
     },
     "color": {
       "type": "object",
diff --git a/src/opengeodeweb_viewer/rpc/model/schemas/set_components_visibility.json b/src/opengeodeweb_viewer/rpc/model/schemas/set_components_visibility.json
index 3f1e7ac..f574a03 100644
--- a/src/opengeodeweb_viewer/rpc/model/schemas/set_components_visibility.json
+++ b/src/opengeodeweb_viewer/rpc/model/schemas/set_components_visibility.json
@@ -3,7 +3,8 @@
   "type": "object",
   "properties": {
     "id": {
-      "type": "string"
+      "type": "string",
+      "minLength": 1
     },
     "visibility": {
       "type": "boolean"
diff --git a/src/opengeodeweb_viewer/rpc/model/schemas/set_corners_size.json b/src/opengeodeweb_viewer/rpc/model/schemas/set_corners_size.json
index 7ae8809..8a286da 100644
--- a/src/opengeodeweb_viewer/rpc/model/schemas/set_corners_size.json
+++ b/src/opengeodeweb_viewer/rpc/model/schemas/set_corners_size.json
@@ -3,7 +3,8 @@
   "type": "object",
   "properties": {
     "id": {
-      "type": "string"
+      "type": "string",
+      "minLength": 1
     },
     "size": {
       "type": "integer"
diff --git a/src/opengeodeweb_viewer/rpc/model/schemas/set_mesh_visibility.json b/src/opengeodeweb_viewer/rpc/model/schemas/set_mesh_visibility.json
index bb09ac8..68daba1 100644
--- a/src/opengeodeweb_viewer/rpc/model/schemas/set_mesh_visibility.json
+++ b/src/opengeodeweb_viewer/rpc/model/schemas/set_mesh_visibility.json
@@ -3,7 +3,8 @@
   "type": "object",
   "properties": {
     "id": {
-      "type": "string"
+      "type": "string",
+      "minLength": 1
     },
     "visibility": {
       "type": "boolean"
diff --git a/src/opengeodeweb_viewer/rpc/viewer/schemas/picked_ids.json b/src/opengeodeweb_viewer/rpc/viewer/schemas/picked_ids.json
index 7073303..699ce50 100644
--- a/src/opengeodeweb_viewer/rpc/viewer/schemas/picked_ids.json
+++ b/src/opengeodeweb_viewer/rpc/viewer/schemas/picked_ids.json
@@ -11,7 +11,8 @@
         "ids": {
             "type": "array",
             "items": {
-                "type": "string"
+                "type": "string",
+                "minLength": 1
             }
         }
     },
diff --git a/src/opengeodeweb_viewer/rpc/viewer/schemas/take_screenshot.json b/src/opengeodeweb_viewer/rpc/viewer/schemas/take_screenshot.json
index f292770..2ae868e 100644
--- a/src/opengeodeweb_viewer/rpc/viewer/schemas/take_screenshot.json
+++ b/src/opengeodeweb_viewer/rpc/viewer/schemas/take_screenshot.json
@@ -3,10 +3,12 @@
   "type": "object",
   "properties": {
     "filename": {
-      "type": "string"
+      "type": "string",
+      "minLength": 1
     },
     "output_extension": {
       "type": "string",
+      "minLength": 1,
       "enum": [
         "png",
         "jpg"
diff --git a/src/opengeodeweb_viewer/rpc/viewer/schemas/update_data.json b/src/opengeodeweb_viewer/rpc/viewer/schemas/update_data.json
index 0efef11..ffccf4b 100644
--- a/src/opengeodeweb_viewer/rpc/viewer/schemas/update_data.json
+++ b/src/opengeodeweb_viewer/rpc/viewer/schemas/update_data.json
@@ -3,7 +3,8 @@
   "type": "object",
   "properties": {
     "id": {
-      "type": "string"
+      "type": "string",
+      "minLength": 1
     }
   },
   "required": [