<?xml version="1.0" encoding="UTF-8"?><CodeSystem xmlns="http://hl7.org/fhir"><id value="evidence-variable-constraint"/><meta><lastUpdated value="2026-03-16T22:59:53.445+00:00"/></meta><text><status value="generated"/><div xmlns="http://www.w3.org/1999/xhtml"><p class="res-header-id"><b>Generated Narrative: CodeSystem evidence-variable-constraint</b></p><a name="evidence-variable-constraint"> </a><a name="hcevidence-variable-constraint"> </a><p>This case-sensitive code system <code>http://hl7.org/fhir/evidence-variable-constraint</code> defines the following codes:</p><table class="codes"><tr><td style="white-space:nowrap"><b>Code</b></td><td><b>Display</b></td><td><b>Definition</b></td></tr><tr><td style="white-space:nowrap">alphanumeric-only<a name="evidence-variable-constraint-alphanumeric-only"> </a></td><td>Alphanumeric Characters Only</td><td>String values that are restricted to only numbers and letters [A-Za-z0-9].</td></tr><tr><td style="white-space:nowrap">alphanumeric-space-only<a name="evidence-variable-constraint-alphanumeric-space-only"> </a></td><td>Alphanumeric and Space Characters Only</td><td>String values that are restricted to only numbers, letters, and spaces [A-Za-z0-9\s].</td></tr><tr><td style="white-space:nowrap">range-zero-to-one<a name="evidence-variable-constraint-range-zero-to-one"> </a></td><td>Range Zero to One</td><td>Numeric value between 0 and 1, inclusive.</td></tr></table></div></text><extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-wg"><valueCode value="cds"/></extension><extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-standards-status"><valueCode value="informative"/></extension><extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-fmm"><valueInteger value="1"/></extension><url value="http://hl7.org/fhir/evidence-variable-constraint"/><version value="6.0.0-ballot4"/><name value="EvidenceVariableConstraint"/><title value="Evidence Variable Constraint"/><status value="active"/><experimental value="false"/><date value="2024-11-14T10:01:24+11:00"/><publisher value="HL7 (FHIR Project)"/><contact><telecom><system value="url"/><value value="http://hl7.org/fhir"/></telecom><telecom><system value="email"/><value value="fhir@lists.hl7.org"/></telecom></contact><description value="A rule, such as a format or other expectation, for the data values."/><jurisdiction><coding><system value="http://unstats.un.org/unsd/methods/m49/m49.htm"/><code value="001"/><display value="World"/></coding></jurisdiction><caseSensitive value="true"/><valueSet value="http://hl7.org/fhir/ValueSet/evidence-variable-constraint"/><content value="complete"/><concept><code value="alphanumeric-only"/><display value="Alphanumeric Characters Only"/><definition value="String values that are restricted to only numbers and letters [A-Za-z0-9]."/></concept><concept><code value="alphanumeric-space-only"/><display value="Alphanumeric and Space Characters Only"/><definition value="String values that are restricted to only numbers, letters, and spaces [A-Za-z0-9\s]."/></concept><concept><code value="range-zero-to-one"/><display value="Range Zero to One"/><definition value="Numeric value between 0 and 1, inclusive."/></concept></CodeSystem>