: Using productontology.org to add Multiple Types? I have recently been reading about productontology.org to define additional types with schema.org to be more specific. I am building a website

@Ann8826881

Your use of additionalType in the first snippet is correct.

An example where additionalType is used can be seen on Schema.org’s IndividualProduct:


<script type="application/ld+json">
{
"@context": "http://schema.org",
"@id": "#product",
"@type": "IndividualProduct",
"additionalType": "http://www.productontology.org/id/Racing_bicycle",
"description": "ACME Racing Bike, bought 8/2008, almost new, with a signature of Eddy Merckx on the frame.",
"name": "ACME Racing Bike in black (2008)"
}
</script>



Adding multiple additional types is possible, too. However, not by adding the property multiple times, but, e.g., by using an array:

<script type="application/ld+json">
{
"@context": "http://schema.org",
"@type": "LocalBusiness",
"additionalType": ["http://www.productontology.org/id/Dog_grooming", "http://www.productontology.org/id/Dog_training"]
}
</script>


Adding multiple additional types can of course be beneficial: if multiple types apply, so be it! It would make no sense to arbitrarily limit it to one additional type only.
You can, of course, add types from various vocabularies; they don’t have to come from the same vocabulary.

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