Prepare 0.4.0: DGDA Drug and LOINC Integration

input/fsh/valueSets/BDICD11SubstancesVS.fsh

@@ -0,0 +1,32 @@
+ValueSet: BDICD11SubstancesVS
+Id: icd11-substances-valueset
+Title: "ICD-11 Substances Value Set"
+Description: """
+Value set containing all ICD-11 MMS substance and medicament concepts
+(XM-prefix concept class: Substance) maintained in the national OCL
+terminology server at https://tr.ocl.dghs.gov.bd.
+
+This value set contains 7,776 substance concepts and is used for coding
+active pharmaceutical ingredients in the `BDMedication.ingredient` element
+to support IPS generation and cross-border data exchange.
+
+This value set is defined and maintained in OCL. It is declared here as a
+minimal stub to allow IG publisher binding resolution only.
+
+**OCL collection canonical:** https://fhir.dghs.gov.bd/core/ValueSet/icd11-substances-valueset
+**OCL FHIR endpoint:** https://tr.ocl.dghs.gov.bd/orgs/MoHFW/collections/icd11-substances-valueset/
+"""
+
+* ^url = "https://fhir.dghs.gov.bd/core/ValueSet/icd11-substances-valueset"
+* ^version = "2025-01"
+* ^status = #active
+* ^experimental = false
+* ^publisher = "World Health Organization (WHO) — served via DGHS National OCL"
+* ^contact.name = "DGHS Health Informatics Unit"
+* ^contact.telecom.system = #url
+* ^contact.telecom.value = "https://dghs.gov.bd"
+* ^jurisdiction = urn:iso:std:iso:3166#BD "Bangladesh"
+* ^immutable = false
+
+* include codes from system "http://id.who.int/icd/release/11/mms"
+    where concept-class = "Substance"