Stores labeling documents submitted by drug manufacturers. “The Structured Product Labeling (SPL) is a document markup standard approved by Health Level Seven (HL7) and adopted by FDA as a mechanism for exchanging product and facility information.” Labels in this system may have updates that have not yet been accepted by FDA.
Reference: https://www.fda.gov/industry/fda-data-standards-advisory-board/structured-product-labeling-resources