Add a nested conditional test

DemoProtocol/DemoProtocol_schema

@@ -45,6 +45,10 @@
             {"isAbout": "../activities/voiceActivity/voiceActivity_schema",
             "variableName": "voiceActivity_schema",
             "prefLabel": {"en": "Voice Activity" }
+            },
+            {"isAbout": "../activities/responsesReferenceActivity/responsesReferenceActivity_schema",
+            "variableName": "responsesReferenceActivity_schema",
+            "prefLabel": {"en": "Global Responses Reference Activity" }
             }
         ],
     "order": [
@@ -53,7 +57,8 @@
             "../activities/Activity3/Activity3_schema",
             "../activities/selectActivity/selectActivity_schema",
             "../activities/voiceActivity/voiceActivity_schema",
-            "../activities/Activity4/Activity4_schema"
+            "../activities/Activity4/Activity4_schema",
+            "../activities/responsesReferenceActivity/responsesReferenceActivity_schema"
         ],
 		"shuffle": false,
 		"allow": [

activities/responsesReferenceActivity/activities/conditionalRefereeActivity_schema

@@ -0,0 +1,26 @@
+{
+    "@context": "https://raw.githubusercontent.com/ReproNim/reproschema/1.0.0/contexts/reproschema",
+    "@type": "reproschema:Activity",
+    "@id": "conditionalRefereeActivity_schema",
+    "prefLabel": "Single Radio Button Activity",
+    "description": "Contains a single radio button item.",
+    "preamble": "Respond to this activity so that the conditional referer activity has a non-null value to reference.",
+    "schemaVersion": "1.0.0",
+    "version": "0.0.1",
+    "ui": {
+        "addProperties": [
+                {"isAbout": "../../selectActivity/items/radio_item",
+                "variableName": "radio_item",
+                "isVis": true
+                }
+        ],
+        "order": [
+            "../../selectActivity/items/radio_item"
+        ],
+        "shuffle": false,
+        "allow": [
+			"reproschema:AutoAdvance",
+			"reproschema:AllowExport"
+		]
+    }
+}

activities/responsesReferenceActivity/activities/conditionalRefererActivity_schema

@@ -0,0 +1,37 @@
+{
+    "@context": "https://raw.githubusercontent.com/ReproNim/reproschema/1.0.0/contexts/reproschema",
+    "@type": "reproschema:Activity",
+    "@id": "conditionalRefererActivity_schema",
+    "prefLabel": "Sibling Reference Activity",
+    "description": "Demos conditional visibility by referring to the global responses variable that stores all responses.",
+    "preamble": "If you selected Response option 1 in the first question, you should see an email question. Otherwise, you should see a text entry question. If you see both or neither, something is broken.",
+    "schemaVersion": "1.0.0",
+    "version": "0.0.1",
+    "ui": {
+        "addProperties": [
+                {"isAbout": "../../Activity3/items/email_item",
+                "variableName": "email_item",
+                "isVis": "[0].includes(referee.radio_item)",
+                  "allow": [
+                    "reproschema:Skipped"
+                ]
+                },
+                {"isAbout": "../../Activity3/items/text_item",
+                "variableName": "text_item",
+                "isVis": "[1, 2].includes(referee.radio_item)",
+                  "allow": [
+                    "reproschema:Skipped"
+                ]
+                }
+        ],
+        "order": [
+            "../../Activity3/items/email_item",
+            "../../Activity3/items/text_item"
+        ],
+        "shuffle": false,
+        "allow": [
+			"reproschema:AutoAdvance",
+			"reproschema:AllowExport"
+		]
+    }
+}

activities/responsesReferenceActivity/responsesReferenceActivity_schema

@@ -0,0 +1,31 @@
+{
+    "@context": "https://raw.githubusercontent.com/ReproNim/reproschema/1.0.0/contexts/reproschema",
+    "@type": "reproschema:Activity",
+    "@id": "responseReferenceActivity_schema",
+    "prefLabel": "Global Responses Reference Activity",
+    "description": "Demonstrates conditional visibility by referring to the global responses variable that stores all responses.",
+    "preamble": "Demonstrates conditional visibility by referring to the global responses variable that stores all responses. After answering the first question, the second question will be determined by referring to your first answer in the global responses object.",
+    "schemaVersion": "1.0.0",
+    "version": "0.0.1",
+    "ui": {
+        "addProperties": [
+                {"isAbout": "activities/conditionalRefereeActivity_schema",
+                "variableName": "referee",
+                "isVis": true
+                },
+                {"isAbout": "activities/conditionalRefererActivity_schema",
+                "variableName": "referer",
+                "isVis": true
+                }
+        ],
+        "order": [
+            "activities/conditionalRefereeActivity_schema",
+            "activities/conditionalRefererActivity_schema"
+        ],
+        "shuffle": false,
+        "allow": [
+			"reproschema:AutoAdvance",
+			"reproschema:AllowExport"
+		]
+    }
+}