update metadata schema and index link

viewer/metadata_schema.md

@@ -0,0 +1,96 @@
+### Base data point
+
+```jsx
+{
+  "start": "",
+  "end": "",
+  "uid": "",
+	"type": {"music","commentary","transcript","video_source","narration_source", "ohms"}
+	"data": {}
+}
+
+```
+
+### Special data types
+
+##### music
+
+```jsx
+{
+	"type": "music"
+	"title": "",
+	"artist": "",
+	"year": ""
+
+	"hyperlink": ""
+}
+```
+
+### **transcript**
+
+```jsx
+{
+	"type": "transcript"
+	"text": "", // note: may contain VTT-compatible styling 
+}
+```
+
+### **footage_source**
+
+```jsx
+{
+	"type": "footage_source",
+	"title": ""
+  "attribution": "",
+	"year": ""
+
+	"hyperlinks": {
+    "hyperlink": "http://example.org",
+    "hyperlink_text": "",
+    "hyperlink_text_alt":, ""
+	}
+}
+```
+
+### **narration_source**
+
+```jsx
+{
+	"type": "narration_source"
+	"title": ""
+  "attribution": "",
+	"year": ""
+
+	"hyperlinks": {
+    "hyperlink": "http://example.org",
+    "hyperlink_text": "",
+    "hyperlink_text_alt":, ""
+	}
+}
+```
+
+### **ohms** (or **concept**) ([http://ohda.matrix.msu.edu/2014/11/indexing-interviews-in-ohms/](http://ohda.matrix.msu.edu/2014/11/indexing-interviews-in-ohms/))
+
+```jsx
+{ // directly copied from webvtt-player (which copies the OHMS standard)
+  "title": "",
+  "title_alt": "",
+  "synopsis": "",
+  "synopsis_alt": "",
+  "keywords": "",
+  "keywords_alt": "",
+  "subjects": "",
+  "subjects_alt": "",
+  "gpspoints": {
+    "gps": "00.0000000, 00.0000000",
+    "gps_zoom": "0",
+    "gps_text": "",
+    "gps_text_alt": ""
+  },
+  "hyperlinks": {
+    "hyperlink": "http://example.org",
+    "hyperlink_text": "",
+    "hyperlink_text_alt":, ""
+  }
+}
+```

viewer/src/pages/index.tsx

@@ -40,7 +40,7 @@ const Home: NextPage = () => {
               documentary metadata viewer
             </h1>
             {/* hug the left-hand side of the screen */}
-            <h2 className=" tracking-tight text-gray-500 dark:text-white  top-20 left-6 absolute"><i>current film</i>: <a href="https://www.youtube.com/watch?v=TGKk3iwoI9I&ab_channel=MIT%3AREGRESSIONS">MIT: REGRESSIONS intro</a> &nbsp; | &nbsp; <a href="https://github.com/mit-regressions/viewer/blob/igel-t3-initial/viewer/public/data/MIT%20Regressions%20intro%20metadata.vtt">metadata source</a></h2>
+            <h2 className=" tracking-tight text-gray-500 dark:text-white  top-20 left-6 absolute"><i>current film</i>: <a href="https://www.youtube.com/watch?v=TGKk3iwoI9I&ab_channel=MIT%3AREGRESSIONS">MIT: REGRESSIONS intro</a> &nbsp; | &nbsp; <a href="https://github.com/mit-regressions/viewer/blob/main/viewer/public/data/MIT%20Regressions%20intro%20metadata.vtt">metadata source</a></h2>
             {/* <h2 className=" tracking-tight text-gray-500 dark:text-white  top-24 left-6 absolute"><i>metadata file source (VTT)</i>: <a href="https://www.youtube.com/watch?v=TGKk3iwoI9I&ab_channel=MIT%3AREGRESSIONS">MIT: REGRESSIONS intro</a></h2> */}
           </div>