Feat: Add 'skip' object to the PISObject schema to allow for partial matches to be described.

schemas/api/envelope.json

@@ -11,11 +11,7 @@
             "description": "Unix timestamp showing when the data was generated, or the time the error was encountered"
         },
         "d": {
-            "description": "Payload data.  Type depends on request endpoint",
-            "anyOf": [
-                {"type": "object"},
-                {"type": "array"}
-            ]
+            "description": "Payload data.  Type depends on request endpoint"
         },
         "e": {
             "type": "object",

schemas/api/pis-object.json

@@ -35,6 +35,20 @@
                 "pattern": "^[a-zA-Z0-9]+$"
             },
             "description": "List of TIPLOC Codes"
+        },
+        "skip": {
+            "type": "object",
+            "properties": {
+                "skip": {
+                    "type": "integer",
+                    "description": "Number of stops to skip"
+                },
+                "position": {
+                    "type": "string",
+                    "enum": ["head", "tail"],
+                    "description": "Position of stops to be skipped, either 'head' or 'tail'"
+                }
+            }
         }
     },
     "required": ["code"],