Fix common schema

schema/subscriptions/Subscription.json

 {
-  "$schema": "http://json-schema.org/schema#",
-  "id": "https://uri.etsi.org/ngsi-ld/schema/Subscription.json",
-  "title": "NGSI-LD Subscription",
-  "description": "NGSI-LD Subscription",
-  "definitions": {
-    "NotificationParams": {
-      "type": "object",
-      "properties": {
-        "attributes": {
-          "type": "array",
-          "minItems": 1,
-          "items": {
-            "type": "string",
-            "minLength": 1
-          },
-          "uniqueItems": true
-        },
-        "format": {
-          "type": "string"
-        },
-        "endpoint": {
-          "$ref": "https://forge.etsi.org/gitlab/NGSI-LD/NGSI-LD/raw/master/schema/common.json#/definitions/Endpoint"
-        },
-        "status": {
-          "type": "string",
-          "enum": [
-            "ok",
-            "failed"
-          ]
-        },
-        "timesSent": {
-          "type": "number",
-          "minimum": 1
-        },
-        "lastNotification": {
-          "type": "string",
-          "format": "date-time"
-        },
-        "lastFailure": {
-          "type": "string",
-          "format": "date-time"
-        },
-        "lastSuccess": {
-          "type": "string",
-          "format": "date-time"
-        }
-      },
-      "required": [
-        "endpoint"
-      ]
-    },
-    "GeoQuery": {
-      "type": "object",
-      "required": [
-        "geometry",
-        "coordinates",
-        "georel"
-      ],
-      "properties": {
-        "georel": {
-          "$ref": "https://forge.etsi.org/gitlab/NGSI-LD/NGSI-LD/raw/master/schema/common.json#/definitions/georel"
-        },
-        "coordinates": {
-          "$ref": "https://forge.etsi.org/gitlab/NGSI-LD/NGSI-LD/raw/master/schema/common.json#/definitions/coordinates"
-        },
-        "geometry": {
-          "$ref": "https://forge.etsi.org/gitlab/NGSI-LD/NGSI-LD/raw/master/schema/common.json#/definitions/geometry"
-        }
-      }
-    }
-  },
-  "type": "object",
-  "properties": {
-    "id": {
-      "type": "string",
-      "format": "uri"
-    },
-    "type": {
-      "type": "string",
-      "const": "Subscription"
-    },
-    "@context": {
-      "$ref": "https://forge.etsi.org/gitlab/NGSI-LD/NGSI-LD/raw/master/schema/common.json#/definitions/LdContext"
-    },
-    "entities": {
-      "type": "array",
-      "items": {
-        "$ref": "https://forge.etsi.org/gitlab/NGSI-LD/NGSI-LD/raw/master/schema/common.json#/definitions/EntityInfo"
-      },
-      "minItems": 1
-    },
-    "name": {
-      "type": "string",
-      "minLength": 1
-    },
-    "description": {
-      "type": "string",
-      "minLength": 1
-    },
-    "notification": {
-      "$ref": "#/definitions/NotificationParams"
-    },
-    "watchedAttributes": {
-      "type": "array",
-      "minItems": 1,
-      "items": {
-        "$ref": "https://forge.etsi.org/gitlab/NGSI-LD/NGSI-LD/raw/master/schema/common.json#/definitions/Name"
-      },
-      "uniqueItems": true
-    },
-    "timeInterval": {
-      "type": "number",
-      "minimum": 0
-    },
-    "expires": {
-      "type": "string",
-      "format": "date-time"
-    },
-    "status": {
-      "type": "string",
-      "enum": [
-        "active",
-        "paused",
-        "expired"
-      ]
-    },
-    "isActive": {
-      "type": "boolean"
-    },
-    "throttling": {
-      "type": "number",
-      "minimum": 1
-    },
-    "q": {
-      "type": "string"
-    },
-    "geoQ": {
-      "$ref": "#/definitions/GeoQuery"  
-    },
-    "csf": {
-      "type": "string"
-    }
-  },
-  "createdAt": {
-    "$ref": "https://forge.etsi.org/gitlab/NGSI-LD/NGSI-LD/raw/master/schema/common.json#/definitions/createdAt"
-  },
-  "modifiedAt": {
-    "$ref": "https://forge.etsi.org/gitlab/NGSI-LD/NGSI-LD/raw/master/schema/common.json#/definitions/modifiedAt"
-  },
-  "allOf": [
-    {
-      "required": [
-        "id",
-        "type"
-      ]
-    },
-    {
-      "anyOf": [
-        {
-          "required": [
-            "entities"
-          ]
-        },
-        {
-          "required": [
-            "watchedAttributes"
-          ]
-        }
-      ]
-    }
-  ]
+	"$schema": "http://json-schema.org/schema#",
+	"id": "https://forge.etsi.org/gitlab/NGSI-LD/NGSI-LD/raw/master/schema/common.json",
+	"title": "NGSI-LD Common Definitions",
+	"description": "NGSI-LD Common",
+	"definitions": {
+		"Name": {
+			"type": "string",
+			"pattern": "^(\\d|[a-zA-Z]|_)+$",
+			"minLength": 1,
+			"description": "NGSI-LD Name"
+		},
+		"observedAt": {
+			"type": "string",
+			"format": "date-time"
+		},
+		"createdAt": {
+			"type": "string",
+			"format": "date-time"
+		},
+		"modifiedAt": {
+			"type": "string",
+			"format": "date-time"
+		},
+		"LdContext": {
+			"anyOf": [{
+					"type": "object"
+				},
+				{
+					"type": "string",
+					"format": "uri"
+				},
+				{
+					"type": "array",
+					"minItems": 1,
+					"items": {
+						"anyOf": [{
+								"type": "string",
+								"format": "uri"
+							},
+							{
+								"type": "object"
+							}
+						]
+					}
+				}
+			]
+		},
+		"Endpoint": {
+			"type": "object",
+			"required": [
+				"uri"
+			],
+			"properties": {
+				"uri": {
+					"type": "string",
+					"format": "uri"
+				},
+				"accept": {
+					"type": "string",
+					"enum": [
+						"application/json",
+						"application/ld+json"
+					]
+				}
+			}
+		},
+		"EntityInfo": {
+			"type": "object",
+			"properties": {
+				"id": {
+					"type": "string",
+					"format": "uri"
+				},
+				"type": {
+					"$ref": "#/definitions/Name"
+				},
+				"idPattern": {
+					"type": "string",
+					"format": "regex"
+				}
+			},
+			"required": [
+				"type"
+			]
+		},
+		"ProblemDetails": {
+			"type": "object",
+			"properties": {
+				"type": {
+					"type": "string",
+					"format": "uri"
+				},
+				"title": {
+					"type": "string"
+				},
+				"detail": {
+					"type": "string"
+				}
+			},
+			"required": [
+				"type"
+			]
+		},
+		"georel": {
+			"anyOf": [{
+					"type": "string",
+					"enum": [
+						"equals",
+						"disjoint",
+						"intersects",
+						"within",
+						"contains",
+						"overlaps"
+					]
+				},
+				{
+					"type": "string",
+					"pattern": "^near;((maxDistance==\\d+)|(minDistance==\\d+))$"
+				}
+			]
+		},
+		"coordinates": {
+			"oneOf": [{
+					"$ref": "https://forge.etsi.org/gitlab/NGSI-LD/NGSI-LD/raw/master/schema/geometry-schema.json#/definitions/position"
+				},
+				{
+					"$ref": "https://forge.etsi.org/gitlab/NGSI-LD/NGSI-LD/raw/master/schema/geometry-schema.json#/definitions/positionArray"
+				},
+				{
+					"$ref": "https://forge.etsi.org/gitlab/NGSI-LD/NGSI-LD/raw/master/schema/geometry-schema.json#/definitions/lineString"
+				},
+				{
+					"$ref": "https://forge.etsi.org/gitlab/NGSI-LD/NGSI-LD/raw/master/schema/geometry-schema.json#/definitions/polygon"
+				}
+			]
+		},
+		"geometry": {
+			"type": "string",
+			"enumeration": [
+				"Point",
+				"MultiPoint",
+				"LineString",
+				"MultiLineString",
+				"Polygon",
+				"MultiPolygon"
+			]
+		}
+	}
 }