test max value set handling.

org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/terminologies/ValueSetUtilities.java

@@ -139,4 +139,28 @@ public class ValueSetUtilities {
     return -1;
   }
 
+  public static ValueSet generateImplicitValueSet(String uri) {
+    if (uri.startsWith("http://snomed.info/sct"))
+      return generateImplicitSnomedValueSet(uri);
+    return null;
+  }
+
+  private static ValueSet generateImplicitSnomedValueSet(String uri) {
+    if ("http://snomed.info/sct?fhir_vs".equals(uri))
+      return makeImplicitSnomedValueSet(uri);
+    return null;
+  }
+
+  private static ValueSet makeImplicitSnomedValueSet(String uri) {
+    ValueSet vs = new ValueSet();
+    vs.setUrl(uri);
+    vs.setName("SCTValueSet");
+    vs.setTitle("SCT ValueSet");
+    vs.setDescription("All SNOMED CT Concepts");
+    vs.setCopyright("This value set includes content from SNOMED CT, which is copyright © 2002+ International Health Terminology Standards Development Organisation (SNOMED International), and distributed by agreement between SNOMED International and HL7. Implementer use of SNOMED CT is not covered by this agreement");
+    vs.setStatus(PublicationStatus.ACTIVE);
+    vs.getCompose().addInclude().setSystem("http://snomed.info/sct");
+    return vs;
+  }
+
 }

org.hl7.fhir.validation/src/main/java/org/hl7/fhir/r5/validation/InstanceValidator.java

@@ -121,6 +121,7 @@ import org.hl7.fhir.r5.model.TypeDetails;
 import org.hl7.fhir.r5.model.UriType;
 import org.hl7.fhir.r5.model.ValueSet;
 import org.hl7.fhir.r5.model.ValueSet.ValueSetExpansionContainsComponent;
+import org.hl7.fhir.r5.terminologies.ValueSetUtilities;
 import org.hl7.fhir.r5.utils.FHIRLexer.FHIRLexerException;
 import org.hl7.fhir.r5.utils.FHIRPathEngine;
 import org.hl7.fhir.r5.utils.FHIRPathEngine.IEvaluationContext;
@@ -2554,6 +2555,8 @@ public class InstanceValidator extends BaseValidator implements IResourceValidat
 					fr = context.fetchResource(ValueSet.class, reference);
 				}
 			}
+			if (fr == null)
+			  fr = ValueSetUtilities.generateImplicitValueSet(reference);
 			txTime = txTime + (System.nanoTime() - t);
         return fr;
       }

org.hl7.fhir.validation/src/test/resources/validation-examples/manifest.json

@@ -854,6 +854,34 @@
 					"errorCount": 1
 				}
 			},
+			"observation-maxvs-base.xml": {
+				"errorCount": 0,
+				"profile": {
+					"source": "maxvalueset-profile.xml",
+					"errorCount": 0
+				}
+			},
+			"observation-maxvs-ex.xml": {
+				"errorCount": 0,
+				"profile": {
+					"source": "maxvalueset-profile.xml",
+					"errorCount": 0
+				}
+			},
+			"observation-maxvs-text.xml": {
+				"errorCount": 0,
+				"profile": {
+					"source": "maxvalueset-profile.xml",
+					"errorCount": 0
+				}
+			},
+			"observation-maxvs-wrong.xml": {
+				"errorCount": 0,
+				"profile": {
+					"source": "maxvalueset-profile.xml",
+					"errorCount": 1
+				}
+			},
       "bundle-local-refs.xml" : {
 				"errorCount": 0,
 				"warningCount": 0

org.hl7.fhir.validation/src/test/resources/validation-examples/maxvalueset-profile.xml

@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<StructureDefinition xmlns="http://hl7.org/fhir">
+	<url value="http://hl7.org/fhir/StructureDefinition/multi-profile-same-resource-profile"/>
+	<name value="MaxValueSetProfile"/>
+	<status value="draft"/>
+	<description value="Profile with max value Set"/>
+	<kind value="resource"/>
+	<abstract value="false"/>
+	<type value="Observation"/>
+	<baseDefinition value="http://hl7.org/fhir/StructureDefinition/Observation"/>
+	<derivation value="constraint"/>
+	<differential>
+		<element id="Observation.code">
+			<path value="Observation.code"/>
+			<min value="1"/>
+			<max value="1"/>
+      <binding>
+        <strength value="extensible"/>
+        <valueSet value="http://hl7.org/fhir/ValueSet/clinical-findings"/>
+        <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-maxValueSet">
+          <valueCanonical value="http://snomed.info/sct?fhir_vs"/>
+        </extension>
+      </binding>
+		</element>
+	</differential>
+</StructureDefinition>

org.hl7.fhir.validation/src/test/resources/validation-examples/observation-maxvs-base.xml

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Observation xmlns="http://hl7.org/fhir">
+  <status value="final"/>
+	<code>
+		<coding>
+			<system value="http://snomed.info/sct"/>
+			<code value="109006"/> 
+			<display value="Anxiety disorder of childhood OR adolescence"/>
+		</coding>
+	</code>
+	<subject>
+		<reference value="Patient/example"/>
+	</subject>
+</Observation>

org.hl7.fhir.validation/src/test/resources/validation-examples/observation-maxvs-ex.xml

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Observation xmlns="http://hl7.org/fhir">
+  <status value="final"/>
+	<code>
+		<coding>
+			<system value="http://snomed.info/sct"/>
+			<code value="106004"/> 
+			<display value="Posterior carpal region"/>
+		</coding>
+	</code>
+	<subject>
+		<reference value="Patient/example"/>
+	</subject>
+</Observation>

org.hl7.fhir.validation/src/test/resources/validation-examples/observation-maxvs-text.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Observation xmlns="http://hl7.org/fhir">
+  <status value="final"/>
+	<code>
+	  <text value="Anxiety disorder of childhood OR adolescence"/>
+	</code>
+	<subject>
+		<reference value="Patient/example"/>
+	</subject>
+</Observation>

org.hl7.fhir.validation/src/test/resources/validation-examples/observation-maxvs-wrong.xml

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Observation xmlns="http://hl7.org/fhir">
+  <status value="final"/>
+	<code>
+		<coding>
+  		<system value="http://loinc.org"/>
+			<code value="29463-7"/>
+			<display value="Body Weight"/>
+    </coding>
+	</code>
+	<subject>
+		<reference value="Patient/example"/>
+	</subject>
+</Observation>