documentation/Event object compatibilty status.md

This document describes what Event object implementations of existing services look like, how they differ and why and what could and should be improved.

## Gancio

```diff
{
  "id": "https://gancio-test.event-federation.eu/federation/m/1",
  "name": "Test Event",
  "url": "https://gancio-test.event-federation.eu/event/test-event",
  "type": "Event",
  "startTime": "2024-01-18T12:10:00.000+01:00",
  "endTime": "2024-01-18T18:30:00.000+01:00",
  "location": {
    "type": "Place"
    "name": "Gmota",
    "address": "Münzgragebenstraße 21, 8010 Graz",
    "latitude": null,
    "longitude": null
  },
  "attachment": [],
  "tag": [],
  "published": "2023-10-13T09:56:25.858Z",
  "attributedTo": "https://gancio-test.event-federation.eu/federation/u/ganciofortesting",
  "to": [
    "https://www.w3.org/ns/activitystreams#Public"
  ],
  "cc": [
    "https://gancio-test.event-federation.eu/federation/u/ganciofortesting/followers"
  ],
-	"content": "\n    📍 Gmota\n    📅 Thursday, 18 January (12:10)\n    \n    This is an awesome test event! Do not miss it!\n\n\n\nFor sure!\n",
+ "content": "This is an awesome test event! Do not miss it!\n\n\n\nFor sure!\n",
  "summary": "\n    📍 Gmota\n    📅 Thursday, 18 January (12:10)\n    \n    This is an awesome test event! Do not miss it!\n\n\n\nFor sure!\n",
  "@context": [
-   "https://www.w3.org/ns/activitystreams"
+   "https://www.w3.org/ns/activitystreams",
+     {
+       "sc": "http://schema.org/",
+       "address": {
+         "@id": "sc:address",
+         "@type": "sc:Text"
+     },
+   }
  ]
}```

The schema stuff got merged right ahead:
https://framagit.org/les/gancio/-/commit/9e1c2c2371e50dd1dbda32b92d5c45e4c0eb0900