Add toRdf version of js22.

Author: gkellogg

tests/toRdf-manifest.html

@@ -6177,6 +6177,34 @@ <h2>
 </dd>
 </dl>
 </dd>
+<dt id='tjs22'>
+Test tjs22 Transform JSON literal (null) aleady in expanded form.
+</dt>
+<dd>
+<dl class='entry'>
+<dt>id</dt>
+<dd>#tjs22</dd>
+<dt>Type</dt>
+<dd>jld:PositiveEvaluationTest, jld:ToRDFTest</dd>
+<dt>Purpose</dt>
+<dd>Tests transforming property with @type @json to a JSON literal (null).</dd>
+<dt>input</dt>
+<dd>
+<a href='toRdf/js22-in.jsonld'>toRdf/js22-in.jsonld</a>
+</dd>
+<dt>expect</dt>
+<dd>
+<a href='toRdf/js22-out.nq'>toRdf/js22-out.nq</a>
+</dd>
+<dt>Options</dt>
+<dd>
+<dl class='options'>
+<dt>specVersion</dt>
+<dd>json-ld-1.1</dd>
+</dl>
+</dd>
+</dl>
+</dd>
 <dt id='tli01'>
 Test tli01 @list containing @list
 </dt>

tests/toRdf-manifest.jsonld

@@ -1884,6 +1884,14 @@
       "input": "toRdf/js21-in.jsonld",
       "expect": "toRdf/js21-out.nq",
       "option": {"specVersion": "json-ld-1.1"}
+    }, {
+      "@id": "#tjs22",
+      "@type": ["jld:PositiveEvaluationTest", "jld:ToRDFTest"],
+      "name": "Transform JSON literal (null) aleady in expanded form.",
+      "purpose": "Tests transforming property with @type @json to a JSON literal (null).",
+      "input": "toRdf/js22-in.jsonld",
+      "expect": "toRdf/js22-out.nq",
+      "option": {"specVersion": "json-ld-1.1"}
     }, {
       "@id": "#tli01",
       "@type": ["jld:PositiveEvaluationTest", "jld:ToRDFTest"],

tests/toRdf/js22-in.jsonld

@@ -0,0 +1,3 @@
+{
+  "http://example.org/vocab#null": {"@value": null, "@type": "@json"}
+}

tests/toRdf/js22-out.nq

@@ -0,0 +1 @@
+_:b0 <http://example.org/vocab#null> "null"^^<http://www.w3.org/1999/02/22-rdf-syntax-ns#JSON> .