pub const CROSS_FORMAT_CONCEPTS: &[&str];Expand description
CROSS_FORMAT_CONCEPT_IDS under the identities earlier releases published.
The order is the same, with strong for strong-emphasis, so consumers
that list or match the published identities keep working. Profile lookups accept
either identity: LanguageProfile::supports_concept and
LanguageProfile::concept_fallback resolve a former identity through
crate::current_concept_id.