{"action":"opened","issue":{"url":"https://api.github.com/repos/mapbox/mapbox-gl-style-spec/issues/509","repository_url":"https://api.github.com/repos/mapbox/mapbox-gl-style-spec","labels_url":"https://api.github.com/repos/mapbox/mapbox-gl-style-spec/issues/509/labels{/name}","comments_url":"https://api.github.com/repos/mapbox/mapbox-gl-style-spec/issues/509/comments","events_url":"https://api.github.com/repos/mapbox/mapbox-gl-style-spec/issues/509/events","html_url":"https://github.com/mapbox/mapbox-gl-style-spec/issues/509","id":179638806,"number":509,"title":"Add \"required\" to layer source documentation","user":{"login":"danswick","id":2365503,"avatar_url":"https://avatars.githubusercontent.com/u/2365503?v=3","gravatar_id":"","url":"https://api.github.com/users/danswick","html_url":"https://github.com/danswick","followers_url":"https://api.github.com/users/danswick/followers","following_url":"https://api.github.com/users/danswick/following{/other_user}","gists_url":"https://api.github.com/users/danswick/gists{/gist_id}","starred_url":"https://api.github.com/users/danswick/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/danswick/subscriptions","organizations_url":"https://api.github.com/users/danswick/orgs","repos_url":"https://api.github.com/users/danswick/repos","events_url":"https://api.github.com/users/danswick/events{/privacy}","received_events_url":"https://api.github.com/users/danswick/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":0,"created_at":"2016-09-27T23:06:48Z","updated_at":"2016-09-27T23:06:48Z","closed_at":null,"body":"Because `background` layers don't require one, a `source` property is technically optional. However, a layer without a `source` or `ref` fails validation, which seems a bit incongruous. "}}
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