Rename 'RDFterm-equal'

[hartig]

As mentioned in this discussion,

It might be better to rename the function. RDFterm-equal puts too much on the "RDFterm" and so reads like 'sameTerm' which it isn't.
[...]
Suggestions for alternative names:

• RDF-value-equals
• sameValue (c.f. sameTerm)
• value-equals

I agree, and I personally like the second alternative most (sameValue).

[rubensworks]

👍 to renaming.

My vote goes to value-equals, or perhaps even equalsValue.

The sameValue alternative intuitively feels like it could mean the same as sameTerm (identical equality), which is not what it is.

[afs]

👍 to renaming.

We could also consider making it a keyword function as well as an operator.

This isn't a suggestion to do this for all operators; they are dispatched by datatype and have backing functions from XQuery/Xpath functions and operators.

• sameValue - preferred. Also add as keyword.
• equalValue - acceptable. Neutral about adding as a keyword.
• With a hyphen - only if it remains invisible; not style consistent.

[afs]

Whatever we do, we should leave a legacy anchor

<span id="#https://www.w3.org/TR/sparql11-query/#func-RDFterm-equal"></span>