add custom type library

lib/entity.libsonnet

@@ -1,3 +1,5 @@
+local types = import "types.libsonnet";
+
 {
   '$id': 'https://picc.app/schemata/v0.1-dev/entity',
   '$schema': 'http://json-schema.org/draft-07/schema',
@@ -9,17 +11,7 @@
   |||,
   type: 'object',
   properties: {
-    id: {
+    id: types.id,
-      description: |||
-        Identifier that is unique within a server. 
-
-        It consists of a string of numbers, upper and/or lower case letters, and special cheracters `-` and `_`.
-      |||,
-      type: 'string',
-      minLength: 1,
-      maxLength: 50,
-      pattern: '^[0-9a-zA-Z-_]+$',
-    },
     name: {
       type: 'string',
       description: |||

lib/types.libsonnet

@@ -0,0 +1,39 @@
+{
+  id: {
+    description: |||
+      Identifier that is unique within a server. 
+
+      It consists of a string of numbers, upper and/or lower case letters, and special cheracter `-`.
+    |||,
+    type: 'string',
+    minLength: 1,
+    maxLength: 50,
+    pattern: '^[0-9a-zA-Z-]+$',
+  },
+
+  location: {
+    description: |||
+      Coordinates of a specific location in the WGS 84 datum.
+    |||,
+    type: 'object',
+    properties: {
+      latitude: {
+        type: 'number',
+        description: "Latitude",
+        minimum: -90,
+        maximum: 90,
+      },
+      longitude: {
+        type: 'number',
+        description: "Longitude",
+        minimum: -180,
+        maximum: 180,
+      },
+      altitude: {
+        description: "Altitude",
+        type: 'number',
+      },
+    },
+    required: ["latitude", "longitude", "altitude"]
+  },
+}