As of 2024-12-05. Based on https://ogp.me/
Examples
og_schema
#> $required
#> [1] "og:title" "og:type" "og:image" "og:url"
#>
#> $optional
#> [1] "og:audio" "og:description" "og:determiner"
#> [4] "og:locale" "og:locale:alternate" "og:site_name"
#> [7] "og:video"
#>
#> $image
#> [1] "og:image:url" "og:image:secure_url" "og:image:type"
#> [4] "og:image:width" "og:image:height" "og:image:alt"
#>
#> $video
#> [1] "og:video:url" "og:video:secure_url" "og:video:type"
#> [4] "og:video:width" "og:video:height" "og:video:alt"
#>
#> $audio
#> [1] "og:audio:url" "og:audio:secure_url" "og:audio:type"
#>
#> $music.song
#> [1] "music:duration" "music:album" "music:album:disc"
#> [4] "music:album:track" "music:musician" "music.album"
#> [7] "music:song" "music:song:disc" "music:song:track"
#> [10] "music:musician" "music:release_date" "music.playlist"
#> [13] "music:song" "music:song:disc" "music:song:track"
#> [16] "music:creator" "music.radio_station" "music:creator"
#>
#> $video.movie
#> [1] "video:actor" "video:actor:role" "video:director"
#> [4] "video:writer" "video:duration" "video:release_date"
#> [7] "video:tag"
#>
#> $video.episode
#> [1] "video:actor" "video:actor:role" "video:director"
#> [4] "video:writer" "video:duration" "video:release_date"
#> [7] "video:tag" "video:series"
#>
#> $video.tv_show
#> [1] "video:actor" "video:actor:role" "video:director"
#> [4] "video:writer" "video:duration" "video:release_date"
#> [7] "video:tag"
#>
#> $video.other
#> [1] "video:actor" "video:actor:role" "video:director"
#> [4] "video:writer" "video:duration" "video:release_date"
#> [7] "video:tag"
#>
#> $article
#> [1] "article:published_time" "article:modified_time"
#> [3] "article:expiration_time" "article:author"
#> [5] "article:section" "article:tag"
#>
#> $book
#> [1] "book:author" "book:isbn" "book:release_date"
#> [4] "book:tag"
#>
#> $profile
#> [1] "profile:first_name" "profile:last_name" "profile:username"
#> [4] "profile:gender"
#>
#> $website
#> NULL
#>