What metadata standards does limbo/ support?

limbo/ supports DDEX ERN (Electronic Release Notification) 3.8.2 and 4.3 for content delivery, ISRC codes for recordings, ISWC for compositions, ISNI for contributor identification, UPC/EAN barcodes for releases, and MEAD-style enrichment, alongside the standard metadata fields required by all major DSPs. The platform validates metadata before delivery to minimize rejections and ensure compliance.