@Override
      public void visitObject(@NotNull JsonObject o) {
        final MultiMap<String, PsiElement> keys = new MultiMap<>();
        for (JsonProperty property : o.getPropertyList()) {
          keys.putValue(property.getName(), property.getNameElement());
        }
        visitKeys(keys, isSchemaFile, holder);
      }
@Override
      public void visitObject(@NotNull JsonObject o)