updated docs to reflect further types of final node (@id, @index)

Author: tinycode2

README.md

@@ -172,7 +172,10 @@ doc.query("so:somepropertynotinyourdocument @value")              // null
 
 doc.queryAll("so:somepropertynotinyourdocument @value")           // []
 
-doc.query("so:favouriteReads[@index=pynchon_gp] so:name @value")  // "Gravity's Rainbox" 
+doc.query("ex:favouriteReads[@index=pynchon_gp] so:name @value")  // "Gravity's Rainbox" 
+
+doc.queryAll("ex:favouriteReads @index")                          // [ "banks-exc", "pynchon-gr" ]
+doc.query("ex:favouriteReads @id")                                // [ "http://www.isbnsearch.org/isbn/9780553575378" ]
 ```
 
 [W3C JSON-LD recommendation]: https://www.w3.org/TR/json-ld/

features/data/person-favourite-reads.json

@@ -9,14 +9,17 @@
         "@value": "Linked person"
     }],
     "http://www.example.org#favouriteReads": [{
+        "@id": "http://www.isbnsearch.org/isbn/9780553575378",
+        "@index": "banks-exc",
         "http://schema.org/author": [{
             "@value": "Iain M Banks"
         }],
         "http://schema.org/name": [{
             "@value": "Excession"
-        }],
-        "@index": "banks-exc"
+        }]
     }, {
+        "@id": "http://www.isbnsearch.org/isbn/9780143039945",
+        "@index": "pynchon-gr",
         "http://schema.org/author": [{
             "@value": "Thomas Pynchon"
         }],
@@ -25,8 +28,7 @@
         }],
         "http://www.example.org#note-to-self": [{
             "@value": "Need to finish reading this"
-        }],
-        "@index": "pynchon-gr"
+        }]
     }],
     "http://xmlns.com/foaf/0.1/firstName": [{
         "@value": "Andrew"