add OGC EDR Part 2 extension

extensions/pubsub/README.md

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+# Standard template
+
+This folder contains the content for OGC API - Environmental Data Retrieval - Part 2: Publish-Subscribe workflow.
+
+
+The repo is organized as follows:
+
+* standard - the main standard document content
+  - organized in multiple sections and directories
+* openapi - normative OpenAPI components specified by the standard
+* examples - JSON and XML examples

extensions/pubsub/examples/json/pubsub-message-payload.json

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+{
+    "id": "31e9d66a-cd83-4174-9429-b932f1abe1be",
+    "version": "v04",
+    "type": "Feature",
+    "geometry": {
+        "type": "Point",
+        "coordinates": [
+            6.146255135536194,
+            46.223296618227444
+        ]   
+    },  
+    "properties": {
+        "pubtime": "2022-03-20T04:50:18.314854383Z",
+        "operation": "create",
+        "datetime": "2022-03-20T04:45:00Z",
+        "integrity": {
+            "method": "sha512",
+            "value": "A2KNxvks...S8qfSCw=="
+        },  
+        "data_id": "dataset/123/data-granule/UANT01_CWAO_200445___15103.bufr4",
+        "metadata_id": "urn:x-wmo:md:can:eccc-msc:observations.swob",
+        "content": {
+            "encoding": "utf-8",
+            "value": "encoded bytes from the file",
+            "size": 457 
+        }   
+    },  
+    "links": [
+        {   
+            "href": "https://example.org/data/4Pubsub/92c557ef-d28e-4713-91af-2e2e7be6f8ab.bufr4",
+            "rel": "canonical",
+            "type": "application/x-bufr"
+        },
+        {
+            "href": "https://example.org/oapi/collections/my-dataset/items/my-data-granule",
+            "rel": "item",
+            "type": "application/json"
+        }
+    ]
+}

extensions/pubsub/examples/yaml/asyncapi.yaml

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+asyncapi: '2.5.0'
+info:
+    title: AsyncAPI demo
+    version: '0.0.1'
+    description: |
+        AsyncAPI description of the proposed Pub/Sub functionality
+    contact:
+        name: Contact Name
+        email: you@example.org
+
+servers:
+    mqtt_prod:
+        url: example.org
+        protocol: mqtt
+        description: MQTT endpoint
+        security:
+            - user-password: []
+defaultContentType: application/json
+
+channels:
+    collections:
+        subscribe:
+            message:
+                $ref: '#/components/messages/collection_msg'
+    collections/wthr_stn:
+        subscribe:
+            message:
+                $ref: '#/components/messages/collection_msg'
+    collections/stream_gage:
+        subscribe:
+            message:
+                $ref: '#/components/messages/collection_msg'
+    collections/wthr_stn/items:
+        subscribe:
+            message:
+                $ref: '#/components/messages/wthr_stn_msg'
+    collections/stream_gage/items:
+        subscribe:
+            message:
+                $ref: '#/components/messages/stream_gage_msg'        
+
+components:
+    messages:
+        collection_msg:
+            description: collection updated notification
+            payload:
+                type: object
+                required:
+                    - id
+                    - href         
+                properties:
+                    id:
+                        type: string
+                        description: collection name
+                    time:
+                        type: string
+                        format: date-time
+                        description: time collection changed 
+                    href:
+                        type: string
+                        format: uri
+                        description: URL of the changed collection               
+        wthr_stn_msg:
+            description: An observation formatted as GeoJSON
+            payload:
+                type: object
+                additionalProperties: false
+                properties:
+                    id:
+                        type: string
+                    type:
+                        type: string
+                    geometry:
+                        type: object
+                        properties:
+                            type: 
+                                type: string
+                            coordinates:
+                                type: array
+                                items:
+                                type: number
+                                format: float
+                    properties:
+                        type: object
+                        properties:
+                            time:
+                                type: string
+                                format: date-time
+                            id:
+                                type: string
+                            wind_direction:
+                                type: number
+                                format: float
+                            wind_speed:
+                                type: number
+                                format: float
+                            wind_gust:
+                                type: number
+                                format: float
+                            visibility:
+                                type: number
+                                format: float
+                            air_temperature:
+                                type: number
+                                format: float
+                            dew_point:
+                                type: number
+                                format: float
+                            mean_sea_level_pressure:
+                                type: number
+                                format: float
+        stream_gage_msg:
+            description: Monitoring station data formatted as GeoJSON
+            payload:
+                type: object
+                additionalProperties: false
+                properties:
+                    id:
+                        type: string
+                    type:
+                        type: string
+                    geometry:
+                        type: object
+                        properties:
+                            type: 
+                                type: string
+                            coordinates:
+                                type: array
+                                items:
+                                type: number
+                                format: float
+                links:
+                    type: array
+                        items: 
+                            type: object
+                            properties:
+                                rel:
+                                    type: string
+                                type:
+                                   type: string
+                                title:
+                                   type: string
+                                href:
+                                    type: string
+                                format: uri
+                properties:
+                    type: object
+                    properties:
+                        datetime:
+                            type: string
+                            format: date-time
+                        label:
+                            type: string
+                        parametername:
+                            type: array
+                            items: 
+                                type: string
+                        edrqueryendpoint:
+                            type: string
+                            format: uri
+    securitySchemes:
+        user-password:
+            type: userPassword

extensions/pubsub/openapi/schemas/link.yaml

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+$schema: 'https://json-schema.org/draft/2020-12/schema'
+$id: 'https://raw.githubusercontent.com/wmo-im/wcmp2/main/schema/wcmpRecordGeoJSON.yaml'
+title: OGC API - Pub/Sub message payload link definition
+description: OGC API - Pub/Sub message payload link definition
+
+allOf:
+  - $ref: 'https://raw.githubusercontent.com/opengeospatial/ogcapi-common/master/19-072/openapi/schemas/link.yaml'
+  - properties:
+      channel:
+        type: string
+        description: topic to subscribe to for Publish-Subscribe workflow

extensions/pubsub/openapi/schemas/pubsub-message-payload-schema.yaml

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+$schema: 'https://json-schema.org/draft/2020-12/schema'
+$id: 'https://raw.githubusercontent.com/wmo-im/wcmp2/main/schema/wcmpRecordGeoJSON.yaml'
+title: OGC API - Pub/Sub message payload definition
+description: OGC API - Pub/Sub message payload definition
+
+required:
+  - id
+  - type
+  - geometry
+  - properties
+
+properties:
+  id:
+    $ref: 'https://raw.githubusercontent.com/opengeospatial/ogcapi-features/master/core/openapi/schemas/featureGeoJSON.yaml#/properties/id'
+  type:
+    $ref: 'https://raw.githubusercontent.com/opengeospatial/ogcapi-features/master/core/openapi/schemas/featureGeoJSON.yaml#/properties/type'
+  geometry:
+    $ref: 'https://raw.githubusercontent.com/opengeospatial/ogcapi-features/master/core/openapi/schemas/featureGeoJSON.yaml#/properties/geometry'
+  properties:
+    type: object
+    required:
+      - pubtime
+    properties:
+      pubtime:
+        type: string
+        format: date-time
+        description: |
+          Identifies the date/time of when the file was posted/published, in RFC3339 format.
+          The publication date/time is critical for subscribers to prevent message loss by knowing
+          their lag (how far behind the publisher they are).
+      operation:
+        type: string
+        description: the event associated with the lifecycle of a resource.
+        enum:
+          - create
+          - update
+          - delete
+        default: create
+  links:
+    $ref: 'https://raw.githubusercontent.com/opengeospatial/ogcapi-features/master/core/openapi/schemas/link.yaml'

extensions/pubsub/standard/Gemfile

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+source "https://rubygems.org"
+
+gem "metanorma-cli"
+gem "relaton-cli"