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diff --git a/std/encoding/_yaml/schema/core.ts b/std/encoding/_yaml/schema/core.ts
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+++ b/std/encoding/_yaml/schema/core.ts
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+// Ported from js-yaml v3.13.1:
+// https://github.com/nodeca/js-yaml/commit/665aadda42349dcae869f12040d9b10ef18d12da
+// Copyright 2011-2015 by Vitaly Puzrin. All rights reserved. MIT license.
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
+
+import { Schema } from "../schema.ts";
+import { json } from "./json.ts";
+
+// Standard YAML's Core schema.
+// http://www.yaml.org/spec/1.2/spec.html#id2804923
+export const core = new Schema({
+  include: [json],
+});