render extends in the docs

dev_tools/docs/nxdl.py

@@ -587,7 +587,6 @@ def _print_doc_enum(self, indent, ns, node, required=False):
             self._print_enumeration(
                 collapse_indent + self._INDENTATION_UNIT, ns, node_list[0]
             )
-
     def _print_attribute(self, ns, kind, node, optional, indent, parent_path):
         name = node.get("name")
         formatted_name = get_rst_formatted_name(node)
@@ -601,6 +600,13 @@ def _print_attribute(self, ns, kind, node, optional, indent, parent_path):
         )
         self._print_doc_enum(indent, ns, node)
 
+
+    def _print_extends_text(self, ns, node, indent):
+        extends_text = node.get("extends", None)
+        if extends_text is not None:
+            # self._print(f"\n{indent}.. index:: deprecated\n")
+            self._print(f"\n{indent}This field extends: {extends_text}\n")
+
     def _print_if_deprecated(self, ns, node, indent):
         deprecated = node.get("deprecated", None)
         if deprecated is not None:
@@ -636,6 +642,7 @@ def _print_full_tree(self, ns, parent, name, indent, parent_path):
                 "\n"
             )
 
+            self._print_extends_text(ns, node, indent + self._INDENTATION_UNIT)
             self._print_if_deprecated(ns, node, indent + self._INDENTATION_UNIT)
             self._print_doc_enum(indent, ns, node)