At Europeana we're trying to harvest LCSH's LOD when our providers use it. And we've spotted an oddity with respect to the use of language tags, which is a key aspect for us.
For example at
How come that the simple SKOS skos:altLabel statements there have values without language tags while the extended SKOS-XL pattern indicates language for the same labels?
PS: and a less important question: how come that there is a handful of skosxl:altLabel statements with simple literal values (with language tags by the way) while this is not allowed in SKOS?
Thanks for the help,