diff --git a/lib/schema/cache.ex b/lib/schema/cache.ex
index 0da30bf..c0b8679 100644
--- a/lib/schema/cache.ex
+++ b/lib/schema/cache.ex
@@ -379,8 +379,7 @@ defmodule Schema.Cache do
   defp read_objects(observable_type_id_map) do
     objects = JsonReader.read_objects()
 
-    observable_type_id_map =
-      observables_from_objects(objects, observable_type_id_map)
+    observable_type_id_map = observables_from_objects(observable_type_id_map, objects)
 
     objects =
       objects
@@ -414,6 +413,7 @@ defmodule Schema.Cache do
     {objects, all_objects, observable_type_id_map}
   end
 
+  @spec observables_from_classes(map()) :: map()
   defp observables_from_classes(classes) do
     Enum.reduce(
       classes,
@@ -422,8 +422,8 @@ defmodule Schema.Cache do
         validate_class_observables(class_key, class)
 
         observable_type_id_map
-        |> observables_from_item_attributes(class, "Class")
-        |> observables_from_item_observables(class, "Class")
+        |> observables_from_item_attributes(classes, class_key, class, "Class")
+        |> observables_from_item_observables(classes, class_key, class, "Class")
       end
     )
   end
@@ -469,37 +469,12 @@ defmodule Schema.Cache do
         System.stop(1)
       end
     end
-
-    if patch_extends?(class) do
-      if Map.has_key?(class, :attributes) and
-           Enum.any?(
-             class[:attributes],
-             fn {_attribute_key, attribute} ->
-               Map.has_key?(attribute, :observable)
-             end
-           ) do
-        Logger.error(
-          "Illegal definition of one or more attributes with \"#{:observable}\" definition in" <>
-            " patch extends class \"#{class_key}\". Observable definitions in patch extends are" <>
-            " not supported. Please file an issue if you find this feature necessary."
-        )
-
-        System.stop(1)
-      end
-
-      if Map.has_key?(class, :observables) do
-        Logger.error(
-          "Illegal \"#{:observables}\" definition in patch extends class \"#{class_key}\"." <>
-            " Observable definitions in patch extends are not supported." <>
-            " Please file an issue if you find this feature necessary."
-        )
-
-        System.stop(1)
-      end
-    end
   end
 
-  defp observables_from_item_attributes(observable_type_id_map, item, kind) do
+  @spec observables_from_item_attributes(map(), map(), atom(), map(), String.t()) :: map()
+  defp observables_from_item_attributes(observable_type_id_map, items, item_key, item, kind) do
+    {caption, _description} = find_item_caption_and_description(items, item_key, item)
+
     if Map.has_key?(item, :attributes) do
       Enum.reduce(
         item[:attributes],
@@ -508,10 +483,10 @@ defmodule Schema.Cache do
           if Map.has_key?(attribute, :observable) do
             observable_type_id = Utils.observable_type_id_to_atom(attribute[:observable])
 
-            if(Map.has_key?(observable_type_id_map, observable_type_id)) do
+            if Map.has_key?(observable_type_id_map, observable_type_id) do
               Logger.error(
                 "Collision of observable type_id #{observable_type_id} between" <>
-                  " \"#{item[:caption]}\" #{kind} attribute \"#{attribute_key}\" and" <>
+                  " \"#{caption}\" #{kind} attribute \"#{attribute_key}\" and" <>
                   " \"#{observable_type_id_map[observable_type_id][:caption]}\""
               )
 
@@ -523,11 +498,9 @@ defmodule Schema.Cache do
                 observable_type_id_map,
                 observable_type_id,
                 %{
-                  caption:
-                    "#{item[:caption]} #{kind}: #{attribute_key} (#{kind}-Specific Attribute)",
+                  caption: "#{caption} #{kind}: #{attribute_key} (#{kind}-Specific Attribute)",
                   description:
-                    "#{kind}-specific attribute \"#{attribute_key}\"" <>
-                      " for the #{item[:caption]} #{kind}."
+                    "#{kind}-specific attribute \"#{attribute_key}\" for the #{caption} #{kind}."
                 }
               )
             end
@@ -541,7 +514,10 @@ defmodule Schema.Cache do
     end
   end
 
-  defp observables_from_item_observables(observable_type_id_map, item, kind) do
+  @spec observables_from_item_observables(map(), map(), atom(), map(), String.t()) :: map()
+  defp observables_from_item_observables(observable_type_id_map, items, item_key, item, kind) do
+    {caption, _description} = find_item_caption_and_description(items, item_key, item)
+
     if Map.has_key?(item, :observables) do
       Enum.reduce(
         item[:observables],
@@ -552,7 +528,7 @@ defmodule Schema.Cache do
           if(Map.has_key?(observable_type_id_map, observable_type_id)) do
             Logger.error(
               "Collision of observable type_id #{observable_type_id} between" <>
-                " \"#{item[:caption]}\" #{kind} attribute path \"#{attribute_path}\" and" <>
+                " \"#{caption}\" #{kind} attribute path \"#{attribute_path}\" and" <>
                 " \"#{observable_type_id_map[observable_type_id][:caption]}\""
             )
 
@@ -565,11 +541,10 @@ defmodule Schema.Cache do
               observable_type_id,
               %{
                 caption:
-                  "#{item[:caption]} #{kind}: #{attribute_path}" <>
-                    " (#{kind}-Specific Attribute Path)",
+                  "#{caption} #{kind}: #{attribute_path} (#{kind}-Specific Attribute Path)",
                 description:
                   "#{kind}-specific attribute on path \"#{attribute_path}\"" <>
-                    " for the #{item[:caption]} #{kind}."
+                    " for the #{caption} #{kind}."
               }
             )
           end
@@ -580,7 +555,8 @@ defmodule Schema.Cache do
     end
   end
 
-  defp observables_from_objects(objects, observable_type_id_map) do
+  @spec observables_from_objects(map(), map()) :: map()
+  defp observables_from_objects(observable_type_id_map, objects) do
     Enum.reduce(
       objects,
       observable_type_id_map,
@@ -588,10 +564,10 @@ defmodule Schema.Cache do
         validate_object_observables(object_key, object)
 
         observable_type_id_map
-        |> observable_from_object(object)
-        |> observables_from_item_attributes(object, "Object")
+        |> observable_from_object(objects, object_key, object)
+        |> observables_from_item_attributes(objects, object_key, object, "Object")
 
-        # Not supported: |> observables_from_item_observables(object, "Object")
+        # Not supported: |> observables_from_item_observables(objects, object_key, object, "Object")
       end
     )
   end
@@ -639,44 +615,19 @@ defmodule Schema.Cache do
         System.stop(1)
       end
     end
-
-    if patch_extends?(object) do
-      if Map.has_key?(object, :attributes) and
-           Enum.any?(
-             object[:attributes],
-             fn {_attribute_key, attribute} ->
-               Map.has_key?(attribute, :observable)
-             end
-           ) do
-        Logger.error(
-          "Illegal definition of one or more attributes with \"#{:observable}\" in patch extends" <>
-            " object \"#{object_key}\". Observable definitions in patch extends are not" <>
-            " supported. Please file an issue if you find this feature necessary."
-        )
-
-        System.stop(1)
-      end
-
-      if Map.has_key?(object, :observable) do
-        Logger.error(
-          "Illegal \"#{:observable}\" definition in patch extends object \"#{object_key}\"." <>
-            " Observable definitions in patch extends are not supported." <>
-            " Please file an issue if you find this feature necessary."
-        )
-
-        System.stop(1)
-      end
-    end
   end
 
-  defp observable_from_object(observable_type_id_map, object) do
+  @spec observable_from_object(map(), map(), atom(), map()) :: map()
+  defp observable_from_object(observable_type_id_map, objects, object_key, object) do
+    {caption, description} = find_item_caption_and_description(objects, object_key, object)
+
     if Map.has_key?(object, :observable) do
       observable_type_id = Utils.observable_type_id_to_atom(object[:observable])
 
       if(Map.has_key?(observable_type_id_map, observable_type_id)) do
         Logger.error(
           "Collision of observable type_id #{observable_type_id} between" <>
-            " \"#{object[:caption]}\" Object \"#{:observable}\" and" <>
+            " \"#{caption}\" Object \"#{:observable}\" and" <>
             " \"#{observable_type_id_map[observable_type_id][:caption]}\""
         )
 
@@ -687,10 +638,7 @@ defmodule Schema.Cache do
         Map.put(
           observable_type_id_map,
           observable_type_id,
-          %{
-            caption: "#{object[:caption]} (Object)",
-            description: object[:description]
-          }
+          %{caption: "#{caption} (Object)", description: description}
         )
       end
     else
@@ -700,11 +648,11 @@ defmodule Schema.Cache do
 
   defp observables_from_dictionary(dictionary, observable_type_id_map) do
     observable_type_id_map
-    |> observables_from_items(dictionary[:types][:attributes], "Dictionary Type")
-    |> observables_from_items(dictionary[:attributes], "Dictionary Attribute")
+    |> observables_from_dictionary_items(dictionary[:types][:attributes], "Dictionary Type")
+    |> observables_from_dictionary_items(dictionary[:attributes], "Dictionary Attribute")
   end
 
-  defp observables_from_items(observable_type_id_map, items, kind) do
+  defp observables_from_dictionary_items(observable_type_id_map, items, kind) do
     if items do
       Enum.reduce(
         items,
@@ -743,6 +691,44 @@ defmodule Schema.Cache do
     end
   end
 
+  @spec find_item_caption_and_description(map(), atom(), map() | nil) :: {String.t(), String.t()}
+  defp find_item_caption_and_description(items, item_key, item)
+       when is_map(items) and is_atom(item_key) do
+    cond do
+      item == nil ->
+        caption = Atom.to_string(item_key)
+        {caption, caption}
+
+      patch_extends?(item) ->
+        find_item_parent_caption_and_description(items, item_key, item)
+
+      item[:caption] != nil ->
+        caption = item[:caption]
+        {caption, item[:description] || caption}
+
+      item[:extends] != nil ->
+        find_item_parent_caption_and_description(items, item_key, item)
+
+      true ->
+        caption = Atom.to_string(item_key)
+        {caption, caption}
+    end
+  end
+
+  @spec find_item_parent_caption_and_description(map(), atom(), map() | nil) ::
+          {String.t(), String.t()}
+  defp find_item_parent_caption_and_description(items, item_key, item)
+       when is_map(items) and is_atom(item_key) do
+    {parent_key, parent_item} = Utils.find_parent(items, item[:extends], item[:extension])
+
+    if parent_key do
+      find_item_caption_and_description(items, parent_key, parent_item)
+    else
+      caption = Atom.to_string(item_key)
+      {caption, caption}
+    end
+  end
+
   @spec hidden_object?(atom() | String.t()) :: boolean()
   defp hidden_object?(object_name) when is_binary(object_name) do
     String.starts_with?(object_name, "_")
@@ -986,8 +972,13 @@ defmodule Schema.Cache do
               |> Map.put(:profiles, profiles)
               |> Map.put(:attributes, attributes)
 
-            # Note: :observable, :observables, and :observable in attributes are not supported,
-            #       so this code does not attempt to patch (merge) them.
+            # Top-level observable.
+            # Only occurs in objects, but is safe to do for classes too.
+            patched_base = Utils.put_non_nil(patched_base, :observable, item[:observable])
+
+            # Top-level path-based observables.
+            # Only occurs in classes, but is safe to do for objects too.
+            patched_base = Utils.put_non_nil(patched_base, :observables, item[:observables])
 
             Map.put(acc, base_key, patched_base)
         end
diff --git a/lib/schema/utils.ex b/lib/schema/utils.ex
index 8897268..be9cf4f 100644
--- a/lib/schema/utils.ex
+++ b/lib/schema/utils.ex
@@ -348,8 +348,17 @@ defmodule Schema.Utils do
     right
   end
 
+  @spec put_non_nil(map(), any(), any()) :: map()
+  def put_non_nil(map, _key, nil) when is_map(map) do
+    map
+  end
+
+  def put_non_nil(map, key, value) when is_map(map) do
+    Map.put(map, key, value)
+  end
+
   @doc """
-    Filter attributes based on the given profiles.
+  Filter attributes based on the given profiles.
   """
   @spec apply_profiles(Enum.t(), nil | list() | MapSet.t()) :: Enum.t()
   def apply_profiles(attributes, nil) do
diff --git a/mix.exs b/mix.exs
index b65bf97..7757993 100644
--- a/mix.exs
+++ b/mix.exs
@@ -10,7 +10,7 @@
 defmodule Schema.MixProject do
   use Mix.Project
 
-  @version "2.69.0"
+  @version "2.70.0"
 
   def project do
     build = System.get_env("GITHUB_RUN_NUMBER") || "SNAPSHOT"
diff --git a/test/test_ocsf_schema/dictionary.json b/test/test_ocsf_schema/dictionary.json
index 74e1881..7dc4866 100644
--- a/test/test_ocsf_schema/dictionary.json
+++ b/test/test_ocsf_schema/dictionary.json
@@ -134,6 +134,11 @@
       "description": "The name of the entity. See specific usage.",
       "type": "string_t"
     },
+    "numeric_value": {
+      "caption": "Numeric Value",
+      "description": "A numeric value.",
+      "type": "float_t"
+    },
     "ob_by_dict_type_1": {
       "caption": "Ob By Dict Type 1",
       "description": "Example 1 of attribute of an observable by dictionary type ob_by_type_t.",
@@ -169,7 +174,7 @@
     },
     "service": {
       "caption": "Service",
-      "description": "A network service.",
+      "description": "A service.",
       "type": "service"
     },
     "source_node": {
@@ -254,6 +259,10 @@
         "type": "string_t",
         "type_name": "String"
       },
+      "float_t": {
+        "caption": "Float",
+        "description": "Real floating-point value."
+      },
       "integer_t": {
         "caption": "Integer",
         "description": "Signed 32-bit integer value."
diff --git a/test/test_ocsf_schema/events/alpha.json b/test/test_ocsf_schema/events/alpha.json
index 3cf6fbc..29cab2e 100644
--- a/test/test_ocsf_schema/events/alpha.json
+++ b/test/test_ocsf_schema/events/alpha.json
@@ -4,7 +4,7 @@
   "description": "The Alpha example event class.",
   "name": "alpha",
   "extends": "ghost",
-  "uid": 2,
+  "uid": 1,
   "profiles": [],
   "attributes": {
     "alpha": {
diff --git a/test/test_ocsf_schema/events/beta.json b/test/test_ocsf_schema/events/beta.json
index 0045dbb..72b150b 100644
--- a/test/test_ocsf_schema/events/beta.json
+++ b/test/test_ocsf_schema/events/beta.json
@@ -4,7 +4,7 @@
   "description": "The Beta example event class.",
   "name": "beta",
   "extends": "ghost",
-  "uid": 3,
+  "uid": 2,
   "profiles": [],
   "attributes": {
     "beta": {
diff --git a/test/test_ocsf_schema/events/eta.json b/test/test_ocsf_schema/events/eta.json
new file mode 100644
index 0000000..b0e09a0
--- /dev/null
+++ b/test/test_ocsf_schema/events/eta.json
@@ -0,0 +1,22 @@
+{
+  "caption": "Eta",
+  "category": "system",
+  "description": "The Eta example event class.",
+  "name": "eta",
+  "extends": "base_event",
+  "uid": 3,
+  "profiles": [],
+  "attributes": {
+    "name": {
+      "description": "The name of this eta.",
+      "requirement": "required",
+      "observable": 104
+    },
+    "service": {
+      "requirement": "recommended"
+    }
+  },
+  "observables": {
+    "service.name": 105
+  }
+}
diff --git a/test/test_ocsf_schema/events/network.json b/test/test_ocsf_schema/events/network.json
index 9a4a186..fea0d67 100644
--- a/test/test_ocsf_schema/events/network.json
+++ b/test/test_ocsf_schema/events/network.json
@@ -4,7 +4,7 @@
   "description": "The Network event represents a network connection.",
   "name": "network",
   "extends": "alpha",
-  "uid": 1,
+  "uid": 4,
   "profiles": [
     "host"
   ],
diff --git a/test/test_ocsf_schema/extensions/rpg/dictionary.json b/test/test_ocsf_schema/extensions/rpg/dictionary.json
index 6284f0d..b047167 100644
--- a/test/test_ocsf_schema/extensions/rpg/dictionary.json
+++ b/test/test_ocsf_schema/extensions/rpg/dictionary.json
@@ -33,6 +33,11 @@
       "description": "Current hit points.",
       "type": "hp_t"
     },
+    "kind": {
+      "caption": "Kind",
+      "description": "A kind.",
+      "type": "string_t"
+    },
     "mana": {
       "caption": "Mana",
       "description": "Current mana, a measure of magical reserves.",
diff --git a/test/test_ocsf_schema/extensions/rpg/events/eta_(patch).json b/test/test_ocsf_schema/extensions/rpg/events/eta_(patch).json
new file mode 100644
index 0000000..a75b6d5
--- /dev/null
+++ b/test/test_ocsf_schema/extensions/rpg/events/eta_(patch).json
@@ -0,0 +1,13 @@
+{
+  "extends": "eta",
+  "attributes": {
+    "service": {
+      "requirement": "recommended",
+      "observable": 42103
+    }
+  },
+  "observables": {
+    "name": 42104,
+    "service.name": 42105
+  }
+}
diff --git a/test/test_ocsf_schema/extensions/rpg/objects/zeta_(patch).json b/test/test_ocsf_schema/extensions/rpg/objects/zeta_(patch).json
new file mode 100644
index 0000000..5728bd8
--- /dev/null
+++ b/test/test_ocsf_schema/extensions/rpg/objects/zeta_(patch).json
@@ -0,0 +1,20 @@
+{
+  "caption": "RPG Zeta",
+  "description": "Patch extends of Zeta for the RPG extension.",
+  "extends": "zeta",
+  "observable": 42202,
+  "attributes": {
+    "name": {
+      "description": "Patched name.",
+      "observable": 42203
+    },
+    "numeric_value": {
+      "description": "Patched numeric value.",
+      "observable": 42204
+    },
+    "kind": {
+      "requirement": "recommended",
+      "observable": 42205
+    }
+  }
+}
diff --git a/test/test_ocsf_schema/objects/_zeta_base_(hidden).json b/test/test_ocsf_schema/objects/_zeta_base_(hidden).json
new file mode 100644
index 0000000..a59bef3
--- /dev/null
+++ b/test/test_ocsf_schema/objects/_zeta_base_(hidden).json
@@ -0,0 +1,14 @@
+{
+  "caption": "Zeta Base",
+  "description": "A zeta base.",
+  "name": "_zeta_base",
+  "attributes": {
+    "name": {
+      "description": "The zeta base's human-friendly name",
+      "requirement": "recommended"
+    },
+    "numeric_value": {
+      "requirement": "required"
+    }
+  }
+}
diff --git a/test/test_ocsf_schema/objects/network_node.json b/test/test_ocsf_schema/objects/network_node.json
index 488ad0e..85a1839 100644
--- a/test/test_ocsf_schema/objects/network_node.json
+++ b/test/test_ocsf_schema/objects/network_node.json
@@ -3,7 +3,7 @@
   "description": "The Network Node object represents a computing device on a network. This is simplified view; the actual OCSF Schema uses far more elaborate model.",
   "name": "network_node",
   "extends": "_entity",
-  "observable": 204,
+  "observable": 203,
   "attributes": {
     "ip": {
       "requirement": "required"
diff --git a/test/test_ocsf_schema/objects/service.json b/test/test_ocsf_schema/objects/service.json
index 7ab0240..e8489cd 100644
--- a/test/test_ocsf_schema/objects/service.json
+++ b/test/test_ocsf_schema/objects/service.json
@@ -1,6 +1,6 @@
 {
   "caption": "Service",
-  "description": "A network service.",
+  "description": "A service.",
   "name": "service",
   "attributes": {
     "name": {
diff --git a/test/test_ocsf_schema/objects/zeta.json b/test/test_ocsf_schema/objects/zeta.json
new file mode 100644
index 0000000..c847eac
--- /dev/null
+++ b/test/test_ocsf_schema/objects/zeta.json
@@ -0,0 +1,15 @@
+{
+  "name": "zeta",
+  "extends": "_zeta_base",
+  "observable": 204,
+  "attributes": {
+    "name": {
+      "description": "The zeta's human-friendly name",
+      "requirement": "recommended"
+    },
+    "numeric_value": {
+      "requirement": "required",
+      "observable": 205
+    }
+  }
+}