Add acq-instrument.json schema and example file

examples/acq-instrument.json

@@ -0,0 +1,14 @@
+{
+    "instrument": [
+       {
+          "instrumentId": "instrument ID",
+          "citation": [],
+          "identifier": {},
+          "instrumentType": "instrument type",
+          "description": "instrument description",
+          "mountedOn": "platformId",
+          "history": ["events list"],
+          "hostId": "host instrument ID"
+       }
+    ]
+}

schema/acq-instrument.json

@@ -1,10 +1,46 @@
 {
-  "id": "acq-.json",
+  "id": "acq-instrument.json",
   "$schema": "https://json-schema.org/draft-04/schema#",
   "description": "",
   "type": "object",
-  "example": "../examples/acq-.json",
+  "example": "../examples/acq-instrument.json",
   "additionalProperties": false,
-  "required": [],
-  "properties": {}
+  "required": ["instrumentId","identifier","instrumentType"],
+  "properties": {
+    "instrumentId": {
+      "type": "string",
+      "description": "a unique identifier for the instrument"
+    },
+    "citation": {
+      "$ref": "./citation.json",
+      "description": "complete citation of the instrument"
+    },
+    "identifier": {
+      "$ref": "./identifier.json",
+      "description": "unique identification of the instrument"
+    },
+    "instrumentType": {
+      "type": "string",
+      "description": "name of the type of instrument. Examples: framing, linescan, push-broom, panframe"
+    },
+    "description": {
+      "type": "string",
+      "description": "textual description of the instrument"
+    },
+    "mountedOn": {
+      "type": "string",
+      "description": "platform on which the instrument is mounted"
+    },
+    "history": {
+      "type": "array",
+      "items": {
+        "type": "string"
+      },
+      "description":  "list of events associated with the instrument"
+    },
+    "hostId": {
+      "$ref": "./identifier.json",
+      "description": "identifier of the hosting instrument for a sensor"
+    }
+  }
 }