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Source1

{
  "resourceType": "CodeSystem",
  "id": "evidence-variable-constraint",
  "meta": {
    "profile": [
      "http://hl7.org/fhir/StructureDefinition/shareablecodesystem"
    ]
  },
  "text": {
    "status": "generated",
    "div": "<!-- snip (see above) -->"
  },
  "extension": [
    {
      "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-wg",
      "valueCode": "cds"
    },
    {
      "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-fmm",
      "valueInteger": 1
    }
  ],
  "url": "http://terminology.hl7.org/CodeSystem/evidence-variable-constraint",
  "version": "1.0.0",
  "name": "EvidenceVariableConstraint",
  "title": "Evidence Variable Constraint",
  "status": "active",
  "experimental": false,
  "date": "2026-05-04T16:55:11+11:00",
  "publisher": "HL7 (FHIR Project)",
  "contact": [
    {
      "telecom": [
        {
          "system": "url",
          "value": "http://hl7.org/fhir"
        },
        {
          "system": "email",
          "value": "fhir@lists.hl7.org"
        }
      ]
    }
  ],
  "description": "A rule or other expectation for data values.",
  "caseSensitive": true,
  "valueSet": "http://terminology.hl7.org/ValueSet/evidence-variable-constraint",
  "content": "complete",
  "concept": [
    {
      "code": "alphanumeric-only",
      "display": "Alphanumeric Characters Only",
      "definition": "String values that are restricted to only numbers and letters [A-Za-z0-9]."
    },
    {
      "code": "alphanumeric-space-only",
      "display": "Alphanumeric and Space Characters Only",
      "definition": "String values that are restricted to only numbers, letters, and spaces [A-Za-z0-9\\s]."
    },
    {
      "code": "range-zero-to-one",
      "display": "Range Zero to One",
      "definition": "Numeric value between 0 and 1, inclusive."
    }
  ]
}