ISSUE-31: BasicLexicalLabelSemantics

ISSUE-31: BasicLexicalLabelSemantics

http://www.w3.org/2006/07/SWD/track/issues/31

Raised by: Alistair Miles
On product: SKOS

Can a resource have two "preferred lexical labels"? Can a lexical label be both
"preferred" and "alternative" for the same resource? If a lexical label is
"hidden", can it also be "preferred" or "alternative" for the same resource?

See also <http://www.w3.org/2006/07/SWD/wiki/SkosDesign/BasicLexicalLabelSemantics>

Imagine the SKOS vocabulary consisted only of skos:prefLabel, skos:altLabel and
skos:hiddenLabel. I.e. forget everything else for the moment.

Now, consider the following RDF graph:

@prefix ex: <http://www.example.com/examples#>.
@prefix skos: <http://www.w3.org/2004/02/skos/core#>.

ex:foo skos:prefLabel "foo"@en.
ex:foo skos:prefLabel "bar"@en.

The resource ex:foo has two different preferred lexical labels in the same
language. Is this graph inconsistent?

What about the following:

@prefix ex: <http://www.example.com/examples#>.
@prefix skos: <http://www.w3.org/2004/02/skos/core#>.

ex:foo skos:prefLabel "foo"@en.
ex:foo skos:altLabel "foo"@en.

The label "foo"@en is given as both a preferred and an alternative lexical label
for the resource ex:foo. Is this graph inconsistent?

Consider another graph:

@prefix ex: <http://www.example.com/examples#>.
@prefix skos: <http://www.w3.org/2004/02/skos/core#>.

ex:foo skos:prefLabel "foo"@en.
ex:foo skos:hiddenLabel "foo"@en.

The label "foo"@en is given as both a preferred and a hidden lexical label for
the resource ex:foo. Is this graph inconsistent?

Finally, consider:

@prefix ex: <http://www.example.com/examples#>.
@prefix skos: <http://www.w3.org/2004/02/skos/core#>.

ex:foo skos:altLabel "foo"@en.
ex:foo skos:hiddenLabel "foo"@en.

The label "foo"@en is given as both an alternative and a hidden lexical label
for the resource ex:foo. Is this graph inconsistent?