Re: Enumeration values

On Sep 6, 2014, at 12:04 PM, Dietrich Schulten <ds@escalon.de> wrote:
> 
> Hi,
> 
> while experimenting with Java annotations for Hydra enabled classes, I
> ran into the problem of enumerated values: schema.org uses
> http://schema.org/Enumeration with many subtypes such as
> http://schema.org/OnSitePickup and it has a general practice to allow
> enumeration values from other vocabs as attribute values, notably
> goodrelations, as in the businessFunction attribute below:
> 
> {
> "@context": {
>       "@vocab" : "http://schema.org/"
>  },
>  "@type": "Movie",
>  "name": "Pirates of the Carribean"
>  "offer": {
>    "businessFunction": "http://purl.org/goodrelations/v1#LeaseOut"
>   }
> }
> 
> An enumeration value is a URL. In the json-ld spec, it is not
> mentioned that I can use a term to define the semantics of an
> attribute *value*.
> 
> When applying enumeration values to a plain json file, the problem
> arises that some mapping might be necessary. Assuming this json:
> 
> {
>  name: "Pirates of the Caribbean",
>  acquire: "RENT",
>  delivery: "IN_SHOP"
> }
> 
> Can I write a context which says that "RENT" means
> http://purl.org/goodrelations/v1#LeaseOut and "IN_SHOP" means
> "http://schema.org/OnSitePickup"? The json-ld spec seems not to
> mention such a usage.
> 
> It seems that terms cannot appear as attribute values unless the
> attribute is @type. Also, jsonld-java doesn't understand what I might
> mean by:

Actually, you want @type: @vocab, which will allow term values without needing a compact URI form.

Gregg

> "@context":
>    {
>      "schema" : "http://schema.org/",
>      "gr" : "http://purl.org/goodrelations/v1#",
> 
>      "RENT" : "gr:LeaseOut",
>      "IN_SHOP": "schema:OnSitePickup"
>    },
>    "schema:name" : "Pirates of the Caribbean",
>    "acquire" : "RENT",
>    "delivery" : "IN_SHOP"
> }
> 
> That leads me to believe that it cannot be done, is that correct?
> 
> The solution for my Java Hydra set of annotations is to allow
> something like this:
> 
> @Expose("BusinessFunction")
> @Term(define = "gr", as = "http://purl.org/goodrelations/v1#")
> enum Acquire {
>  @Expose("gr:LeaseOut")
>  RENT
> }
> 
> If the client accepts json-ld, it will get the full url value, for
> other json varieties it will render "RENT". But hey, what a noise,
> even if I make the @Term a package annotation.
> 
> Best regards,
> Dietrich
> 
> -- 
> Dietrich Schulten
> Escalon System-Entwicklung
> Bubenhalde 10
> 74199 Untergruppenbach
> +49 172 7369456
>

Received on Saturday, 6 September 2014 13:21:49 UTC