Single value sets

[labra]

A very common pattern is to define a value set with a single element. For example:

:SpanishProduct {
 :country [:Spain]
}

Although this syntax is ok, one of the most common errors is to try to define the previous shape as:

:SpanishProduct {
 :country :Spain
}

which is not what is intended (that declares that values should belong to a type :Spain.

Having some syntactic sugar for single value shapes would make this feature less error-prone. One possibility would be the equals sign.

:SpanishProduct {
 :country = :Spain
}

[ericprud]

my temptation is to save "=" for defaults, which don't have any

The current semantics but could be useful for form-building etc.

[andrawaag]

We close this due to inactivity, @labra feel free to reopen if still relevant.