HL7 FHIR Security Label Syntax represents the technical syntactic structure of HL7 FHIR Security Labels as applied to FHIR resources in MyHealth@MyHands. Security Labels are structured metadata tags attached to individual FHIR resources that enforce access policies by marking data with confidentiality levels (Normal, Restricted, Very Restricted). They realise the Maccess.policy sub-domain at the individual FHIR resource level.