Suggestion: add age recommendation example to https://schema.org/Book #3688
Description
I suggest that you add an example of how to specify an age recommendation for a book. This would have real world use, because age recommendations are commonly used to categorize book in automated web shop categories and for actual physical placement in a physical book shop. So having this information in a machine-readable format would be useful.
Sadly, the example given seems to only use some "isFamilyFriendly" which seems somewhat detached from real world scenarios:
<script type="application/ld+json">
{
"@context": "https://schema.org",
"@type": "Book",
"accessibilityAPI": "ARIA",
"accessibilityControl": [
"fullKeyboardControl",
"fullMouseControl"
],
"accessibilityFeature": [
"largePrint/CSSEnabled",
"highContrast/CSSEnabled",
"resizeText/CSSEnabled",
"displayTransformability",
"longDescription",
"alternativeText"
],
"accessibilityHazard": [
"noFlashingHazard",
"noMotionSimulationHazard",
"noSoundHazard"
],
"aggregateRating": {
"@type": "AggregateRating",
"reviewCount": "0"
},
"bookFormat": "EBook/DAISY3",
"copyrightHolder": {
"@type": "Organization",
"name": "Holt, Rinehart and Winston"
},
"copyrightYear": "2007",
"description": "NIMAC-sourced textbook",
"genre": "Educational Materials",
"inLanguage": "en-US",
"isFamilyFriendly": "true",
"isbn": "9780030426599",
"name": "Holt Physical Science",
"numberOfPages": "598",
"publisher": {
"@type": "Organization",
"name": "Holt, Rinehart and Winston"
}
}
</script>
At least in Europe, books are sorted by age recommendation with the granularity of years, so 13+, 14+, etc. This doesn't map to this "isFamilyFriendly" tag presented in the example.
For movies and other visual media, where a minimum age may even be legally binding, this tag would be useful as well.