diff --git a/hapi-fhir-base/src/main/java/ca/uhn/fhir/util/FhirTerser.java b/hapi-fhir-base/src/main/java/ca/uhn/fhir/util/FhirTerser.java
index 44550187d2b..ca32e26447c 100644
--- a/hapi-fhir-base/src/main/java/ca/uhn/fhir/util/FhirTerser.java
+++ b/hapi-fhir-base/src/main/java/ca/uhn/fhir/util/FhirTerser.java
@@ -287,7 +287,7 @@ public class FhirTerser {
 				retVal = new ArrayList<>();
 				for (T nextElement : values) {
 					BaseRuntimeElementCompositeDefinition<?> nextChildDef = (BaseRuntimeElementCompositeDefinition<?>) myContext.getElementDefinition((Class<? extends IBase>) nextElement.getClass());
-					List<T> foundValues = getValues(nextChildDef, nextElement, theSubList.subList(1, theSubList.size()), theWantedClass);
+					List<T> foundValues = getValues(nextChildDef, nextElement, theSubList.subList(1, theSubList.size()), theWantedClass, theCreate);
 					retVal.addAll(foundValues);
 				}
 			}
@@ -332,7 +332,7 @@ public class FhirTerser {
 				retVal = new ArrayList<>();
 				for (T nextElement : values) {
 					BaseRuntimeElementCompositeDefinition<?> nextChildDef = (BaseRuntimeElementCompositeDefinition<?>) myContext.getElementDefinition((Class<? extends IBase>) nextElement.getClass());
-					List<T> foundValues = getValues(nextChildDef, nextElement, theSubList.subList(1, theSubList.size()), theWantedClass);
+					List<T> foundValues = getValues(nextChildDef, nextElement, theSubList.subList(1, theSubList.size()), theWantedClass, theCreate);
 					retVal.addAll(foundValues);
 				}
 			}
@@ -381,7 +381,7 @@ public class FhirTerser {
 		} else {
 			for (IBase nextElement : values) {
 				BaseRuntimeElementCompositeDefinition<?> nextChildDef = (BaseRuntimeElementCompositeDefinition<?>) myContext.getElementDefinition(nextElement.getClass());
-				List<T> foundValues = getValues(nextChildDef, nextElement, theSubList.subList(1, theSubList.size()), theWantedClass);
+				List<T> foundValues = getValues(nextChildDef, nextElement, theSubList.subList(1, theSubList.size()), theWantedClass, theCreate);
 				retVal.addAll(foundValues);
 			}
 		}
diff --git a/hapi-fhir-structures-dstu2/src/test/java/ca/uhn/fhir/util/FhirTerserDstu2Test.java b/hapi-fhir-structures-dstu2/src/test/java/ca/uhn/fhir/util/FhirTerserDstu2Test.java
index 0139b2d6b13..e66eabdc9cd 100644
--- a/hapi-fhir-structures-dstu2/src/test/java/ca/uhn/fhir/util/FhirTerserDstu2Test.java
+++ b/hapi-fhir-structures-dstu2/src/test/java/ca/uhn/fhir/util/FhirTerserDstu2Test.java
@@ -185,6 +185,7 @@ public class FhirTerserDstu2Test {
 		p.setActive(true);
 		p.addUndeclaredExtension(false, "http://acme.org/extension", new StringDt("value"));
 		p.addUndeclaredExtension(false, "http://acme.org/otherExtension", new StringDt("otherValue"));
+		p.addUndeclaredExtension(false, "http://acme.org/parentExtension").addUndeclaredExtension(false, "http://acme.org/childExtension", new StringDt("nestedValue"));
 
 		System.out.println(ourCtx.newJsonParser().setPrettyPrint(true).encodeResourceToString(p));
 
@@ -200,6 +201,13 @@ public class FhirTerserDstu2Test {
 		assertTrue(values.get(0) instanceof ExtensionDt);
 		assertEquals("http://acme.org/extension", ((ExtensionDt) values.get(0)).getUrl());
 		assertEquals("value", ((StringDt) ((ExtensionDt) values.get(0)).getValue()).getValueAsString());
+
+		values = ourCtx.newTerser().getValues(p, "Patient.extension('http://acme.org/parentExtension').extension('http://acme.org/childExtension')");
+		assertEquals(1, values.size());
+		assertTrue(values.get(0) instanceof IBaseExtension);
+		assertTrue(values.get(0) instanceof ExtensionDt);
+		assertEquals("http://acme.org/childExtension", ((ExtensionDt) values.get(0)).getUrl());
+		assertEquals("nestedValue", ((StringDt) ((ExtensionDt) values.get(0)).getValue()).getValueAsString());
 	}
 
 	@Test
@@ -208,6 +216,7 @@ public class FhirTerserDstu2Test {
 		p.setActive(true);
 		p.addUndeclaredExtension(false, "http://acme.org/extension", new StringDt("value"));
 		p.addUndeclaredExtension(false, "http://acme.org/otherExtension", new StringDt("otherValue"));
+		p.addUndeclaredExtension(false, "http://acme.org/parentExtension").addUndeclaredExtension(false, "http://acme.org/childExtension", new StringDt("nestedValue"));
 
 		System.out.println(ourCtx.newJsonParser().setPrettyPrint(true).encodeResourceToString(p));
 
@@ -244,6 +253,24 @@ public class FhirTerserDstu2Test {
 		assertTrue(values.get(0) instanceof ExtensionDt);
 		assertEquals("http://acme.org/extension", ((ExtensionDt) values.get(0)).getUrl());
 		assertEquals("modifiedValue", ((StringDt) ((ExtensionDt) values.get(0)).getValue()).getValueAsString());
+
+		values = ourCtx.newTerser().getValues(p, "Patient.extension('http://acme.org/parentExtension').extension('http://acme.org/childExtension')");
+		assertEquals(1, values.size());
+		assertTrue(values.get(0) instanceof IBaseExtension);
+		assertTrue(values.get(0) instanceof ExtensionDt);
+		assertEquals("http://acme.org/childExtension", ((ExtensionDt) values.get(0)).getUrl());
+		assertEquals("nestedValue", ((StringDt) ((ExtensionDt) values.get(0)).getValue()).getValueAsString());
+
+		((ExtensionDt) values.get(0)).setValue(new StringDt("modifiedNestedValue"));
+
+		System.out.println(ourCtx.newJsonParser().setPrettyPrint(true).encodeResourceToString(p));
+
+		values = ourCtx.newTerser().getValues(p, "Patient.extension('http://acme.org/parentExtension').extension('http://acme.org/childExtension')");
+		assertEquals(1, values.size());
+		assertTrue(values.get(0) instanceof IBaseExtension);
+		assertTrue(values.get(0) instanceof ExtensionDt);
+		assertEquals("http://acme.org/childExtension", ((ExtensionDt) values.get(0)).getUrl());
+		assertEquals("modifiedNestedValue", ((StringDt) ((ExtensionDt) values.get(0)).getValue()).getValueAsString());
 	}
 
 	@Test
@@ -252,6 +279,8 @@ public class FhirTerserDstu2Test {
 		p.addUndeclaredExtension(false, "http://acme.org/extension", new StringDt("value1"));
 		p.addUndeclaredExtension(false, "http://acme.org/extension", new StringDt("value2"));
 		p.addUndeclaredExtension(false, "http://acme.org/otherExtension", new StringDt("otherValue"));
+		p.addUndeclaredExtension(false, "http://acme.org/parentExtension").addUndeclaredExtension(false, "http://acme.org/childExtension", new StringDt("nestedValue1"));
+		p.addUndeclaredExtension(false, "http://acme.org/parentExtension").addUndeclaredExtension(false, "http://acme.org/childExtension", new StringDt("nestedValue2"));
 
 		System.out.println(ourCtx.newJsonParser().setPrettyPrint(true).encodeResourceToString(p));
 
@@ -265,6 +294,17 @@ public class FhirTerserDstu2Test {
 		assertTrue(values.get(1) instanceof ExtensionDt);
 		assertEquals("http://acme.org/extension", ((ExtensionDt) values.get(1)).getUrl());
 		assertEquals("value2", ((StringDt) ((ExtensionDt) values.get(1)).getValue()).getValueAsString());
+
+		values = ourCtx.newTerser().getValues(p, "Patient.extension('http://acme.org/parentExtension').extension('http://acme.org/childExtension')");
+		assertEquals(2, values.size());
+		assertTrue(values.get(0) instanceof IBaseExtension);
+		assertTrue(values.get(0) instanceof ExtensionDt);
+		assertEquals("http://acme.org/childExtension", ((ExtensionDt) values.get(0)).getUrl());
+		assertEquals("nestedValue1", ((StringDt) ((ExtensionDt) values.get(0)).getValue()).getValueAsString());
+		assertTrue(values.get(1) instanceof IBaseExtension);
+		assertTrue(values.get(1) instanceof ExtensionDt);
+		assertEquals("http://acme.org/childExtension", ((ExtensionDt) values.get(1)).getUrl());
+		assertEquals("nestedValue2", ((StringDt) ((ExtensionDt) values.get(1)).getValue()).getValueAsString());
 	}
 
 	@Test
@@ -273,6 +313,7 @@ public class FhirTerserDstu2Test {
 		p.setActive(true);
 		p.addUndeclaredExtension(false, "http://acme.org/extension", new StringDt("value"));
 		p.addUndeclaredExtension(false, "http://acme.org/otherExtension", new StringDt("otherValue"));
+		p.addUndeclaredExtension(false, "http://acme.org/parentExtension").addUndeclaredExtension(false, "http://acme.org/childExtension", new StringDt("nestedValue"));
 
 		System.out.println(ourCtx.newJsonParser().setPrettyPrint(true).encodeResourceToString(p));
 
@@ -285,7 +326,13 @@ public class FhirTerserDstu2Test {
 		assertEquals(1, extValues.size());
 		assertTrue(extValues.get(0).getValue() instanceof StringDt);
 		assertEquals("http://acme.org/extension", extValues.get(0).getUrl());
-		assertEquals("value", ((StringDt) (extValues.get(0).getValue())).getValueAsString());
+		assertEquals("value", ((StringDt) extValues.get(0).getValue()).getValueAsString());
+
+		extValues = ourCtx.newTerser().getValues(p, "Patient.extension('http://acme.org/parentExtension').extension('http://acme.org/childExtension')", ExtensionDt.class);
+		assertEquals(1, extValues.size());
+		assertTrue(extValues.get(0).getValue() instanceof StringDt);
+		assertEquals("http://acme.org/childExtension", extValues.get(0).getUrl());
+		assertEquals("nestedValue", ((StringDt) extValues.get(0).getValue()).getValueAsString());
 	}
 
 	@Test
@@ -294,6 +341,7 @@ public class FhirTerserDstu2Test {
 		p.setActive(true);
 		p.addUndeclaredExtension(false, "http://acme.org/extension", new StringDt("value"));
 		p.addUndeclaredExtension(false, "http://acme.org/otherExtension", new StringDt("otherValue"));
+		p.addUndeclaredExtension(false, "http://acme.org/parentExtension").addUndeclaredExtension(false, "http://acme.org/childExtension", new StringDt("nestedValue"));
 
 		System.out.println(ourCtx.newJsonParser().setPrettyPrint(true).encodeResourceToString(p));
 
@@ -326,6 +374,22 @@ public class FhirTerserDstu2Test {
 		assertTrue(extValues.get(0).getValue() instanceof StringDt);
 		assertEquals("http://acme.org/extension", extValues.get(0).getUrl());
 		assertEquals("modifiedValue", ((StringDt) (extValues.get(0).getValue())).getValueAsString());
+
+		extValues = ourCtx.newTerser().getValues(p, "Patient.extension('http://acme.org/parentExtension').extension('http://acme.org/childExtension')", ExtensionDt.class);
+		assertEquals(1, extValues.size());
+		assertTrue(extValues.get(0).getValue() instanceof StringDt);
+		assertEquals("http://acme.org/childExtension", extValues.get(0).getUrl());
+		assertEquals("nestedValue", ((StringDt) extValues.get(0).getValue()).getValueAsString());
+
+		extValues.get(0).setValue(new StringDt("modifiedNestedValue"));
+
+		System.out.println(ourCtx.newJsonParser().setPrettyPrint(true).encodeResourceToString(p));
+
+		extValues = ourCtx.newTerser().getValues(p, "Patient.extension('http://acme.org/parentExtension').extension('http://acme.org/childExtension')", ExtensionDt.class);
+		assertEquals(1, extValues.size());
+		assertTrue(extValues.get(0).getValue() instanceof StringDt);
+		assertEquals("http://acme.org/childExtension", extValues.get(0).getUrl());
+		assertEquals("modifiedNestedValue", ((StringDt) extValues.get(0).getValue()).getValueAsString());
 	}
 
 	@Test
@@ -343,6 +407,11 @@ public class FhirTerserDstu2Test {
 		assertEquals(1, extValues.size());
 		assertEquals("http://acme.org/extension", extValues.get(0).getUrl());
 		assertNull(extValues.get(0).getValue());
+
+		extValues = ourCtx.newTerser().getValues(p, "Patient.extension('http://acme.org/parentExtension').extension('http://acme.org/childExtension')", ExtensionDt.class, true);
+		assertEquals(1, extValues.size());
+		assertEquals("http://acme.org/childExtension", extValues.get(0).getUrl());
+		assertNull(extValues.get(0).getValue());
 	}
 
 	@Test
@@ -363,6 +432,13 @@ public class FhirTerserDstu2Test {
 		assertTrue(values.get(0) instanceof ExtensionDt);
 		assertEquals("http://acme.org/extension", ((ExtensionDt) values.get(0)).getUrl());
 		assertNull(((ExtensionDt) values.get(0)).getValue());
+
+		values = ourCtx.newTerser().getValues(p, "Patient.extension('http://acme.org/parentExtension').extension('http://acme.org/childExtension')", true);
+		assertEquals(1, values.size());
+		assertTrue(values.get(0) instanceof IBaseExtension);
+		assertTrue(values.get(0) instanceof ExtensionDt);
+		assertEquals("http://acme.org/childExtension", ((ExtensionDt) values.get(0)).getUrl());
+		assertNull(((ExtensionDt) values.get(0)).getValue());
 	}
 
 	@Test
@@ -371,6 +447,7 @@ public class FhirTerserDstu2Test {
 		p.setActive(true);
 		p.addUndeclaredExtension(false, "http://acme.org/extension", new StringDt("value"));
 		p.addUndeclaredExtension(false, "http://acme.org/otherExtension", new StringDt("otherValue"));
+		p.addUndeclaredExtension(false, "http://acme.org/parentExtension").addUndeclaredExtension(false, "http://acme.org/childExtension", new StringDt("nestedValue"));
 
 		System.out.println(ourCtx.newJsonParser().setPrettyPrint(true).encodeResourceToString(p));
 
@@ -380,12 +457,19 @@ public class FhirTerserDstu2Test {
 		assertTrue(values.get(0) instanceof BooleanDt);
 		assertTrue(((BooleanDt) values.get(0)).getValue());
 
-		values = ourCtx.newTerser().getValues(p, "Patient.extension('http://acme.org/extension')");
+		values = ourCtx.newTerser().getValues(p, "Patient.extension('http://acme.org/extension')", true);
 		assertEquals(1, values.size());
 		assertTrue(values.get(0) instanceof IBaseExtension);
 		assertTrue(values.get(0) instanceof ExtensionDt);
 		assertEquals("http://acme.org/extension", ((ExtensionDt) values.get(0)).getUrl());
 		assertEquals("value", ((StringDt) ((ExtensionDt) values.get(0)).getValue()).getValueAsString());
+
+		values = ourCtx.newTerser().getValues(p, "Patient.extension('http://acme.org/parentExtension').extension('http://acme.org/childExtension')", true);
+		assertEquals(1, values.size());
+		assertTrue(values.get(0) instanceof IBaseExtension);
+		assertTrue(values.get(0) instanceof ExtensionDt);
+		assertEquals("http://acme.org/childExtension", ((ExtensionDt) values.get(0)).getUrl());
+		assertEquals("nestedValue", ((StringDt) ((ExtensionDt) values.get(0)).getValue()).getValueAsString());
 	}
 	
 	@Test
diff --git a/hapi-fhir-structures-dstu3/src/test/java/ca/uhn/fhir/util/FhirTerserDstu3Test.java b/hapi-fhir-structures-dstu3/src/test/java/ca/uhn/fhir/util/FhirTerserDstu3Test.java
index bf0ffde4ee0..923762241f8 100644
--- a/hapi-fhir-structures-dstu3/src/test/java/ca/uhn/fhir/util/FhirTerserDstu3Test.java
+++ b/hapi-fhir-structures-dstu3/src/test/java/ca/uhn/fhir/util/FhirTerserDstu3Test.java
@@ -182,6 +182,11 @@ public class FhirTerserDstu3Test {
 		p.addModifierExtension()
 			.setUrl("http://acme.org/modifierExtension")
 			.setValue(new StringType("modifierValue"));
+		p.addExtension()
+			.setUrl("http://acme.org/parentExtension")
+			.addExtension()
+			.setUrl("http://acme.org/childExtension")
+			.setValue(new StringType("nestedValue"));
 
 		System.out.println(ourCtx.newJsonParser().setPrettyPrint(true).encodeResourceToString(p));
 
@@ -204,6 +209,13 @@ public class FhirTerserDstu3Test {
 		assertTrue(values.get(0) instanceof Extension);
 		assertEquals("http://acme.org/modifierExtension", ((Extension) values.get(0)).getUrl());
 		assertEquals("modifierValue", ((StringType) ((Extension) values.get(0)).getValue()).getValueAsString());
+
+		values = ourCtx.newTerser().getValues(p, "Patient.extension('http://acme.org/parentExtension').extension('http://acme.org/childExtension')");
+		assertEquals(1, values.size());
+		assertTrue(values.get(0) instanceof  IBaseExtension);
+		assertTrue(values.get(0) instanceof Extension);
+		assertEquals("http://acme.org/childExtension", ((Extension) values.get(0)).getUrl());
+		assertEquals("nestedValue", ((StringType) ((Extension) values.get(0)).getValue()).getValueAsString());
 	}
 
 	@Test
@@ -219,6 +231,11 @@ public class FhirTerserDstu3Test {
 		p.addModifierExtension()
 			.setUrl("http://acme.org/modifierExtension")
 			.setValue(new StringType("modifierValue"));
+		p.addExtension()
+			.setUrl("http://acme.org/parentExtension")
+			.addExtension()
+			.setUrl("http://acme.org/childExtension")
+			.setValue(new StringType("nestedValue"));
 
 		System.out.println(ourCtx.newJsonParser().setPrettyPrint(true).encodeResourceToString(p));
 
@@ -273,6 +290,24 @@ public class FhirTerserDstu3Test {
 		assertTrue(values.get(0) instanceof Extension);
 		assertEquals("http://acme.org/modifierExtension", ((Extension) values.get(0)).getUrl());
 		assertEquals("modifiedModifierValue", ((StringType) ((Extension) values.get(0)).getValue()).getValueAsString());
+
+		values = ourCtx.newTerser().getValues(p, "Patient.extension('http://acme.org/parentExtension').extension('http://acme.org/childExtension')");
+		assertEquals(1, values.size());
+		assertTrue(values.get(0) instanceof  IBaseExtension);
+		assertTrue(values.get(0) instanceof Extension);
+		assertEquals("http://acme.org/childExtension", ((Extension) values.get(0)).getUrl());
+		assertEquals("nestedValue", ((StringType) ((Extension) values.get(0)).getValue()).getValueAsString());
+
+		((Extension) values.get(0)).setValue(new StringType("modifiedNestedValue"));
+
+		System.out.println(ourCtx.newJsonParser().setPrettyPrint(true).encodeResourceToString(p));
+
+		values = ourCtx.newTerser().getValues(p, "Patient.extension('http://acme.org/parentExtension').extension('http://acme.org/childExtension')");
+		assertEquals(1, values.size());
+		assertTrue(values.get(0) instanceof  IBaseExtension);
+		assertTrue(values.get(0) instanceof Extension);
+		assertEquals("http://acme.org/childExtension", ((Extension) values.get(0)).getUrl());
+		assertEquals("modifiedNestedValue", ((StringType) ((Extension) values.get(0)).getValue()).getValueAsString());
 	}
 
 	@Test
@@ -293,6 +328,16 @@ public class FhirTerserDstu3Test {
 		p.addModifierExtension()
 			.setUrl("http://acme.org/modifierExtension")
 			.setValue(new StringType("modifierValue2"));
+		p.addExtension()
+			.setUrl("http://acme.org/parentExtension")
+			.addExtension()
+			.setUrl("http://acme.org/childExtension")
+			.setValue(new StringType("nestedValue1"));
+		p.addExtension()
+			.setUrl("http://acme.org/parentExtension")
+			.addExtension()
+			.setUrl("http://acme.org/childExtension")
+			.setValue(new StringType("nestedValue2"));
 
 		System.out.println(ourCtx.newJsonParser().setPrettyPrint(true).encodeResourceToString(p));
 
@@ -317,6 +362,17 @@ public class FhirTerserDstu3Test {
 		assertTrue(values.get(1) instanceof Extension);
 		assertEquals("http://acme.org/modifierExtension", ((Extension) values.get(1)).getUrl());
 		assertEquals("modifierValue2", ((StringType) ((Extension) values.get(1)).getValue()).getValueAsString());
+
+		values = ourCtx.newTerser().getValues(p, "Patient.extension('http://acme.org/parentExtension').extension('http://acme.org/childExtension')");
+		assertEquals(2, values.size());
+		assertTrue(values.get(0) instanceof  IBaseExtension);
+		assertTrue(values.get(0) instanceof Extension);
+		assertEquals("http://acme.org/childExtension", ((Extension) values.get(0)).getUrl());
+		assertEquals("nestedValue1", ((StringType) ((Extension) values.get(0)).getValue()).getValueAsString());
+		assertTrue(values.get(1) instanceof  IBaseExtension);
+		assertTrue(values.get(1) instanceof Extension);
+		assertEquals("http://acme.org/childExtension", ((Extension) values.get(1)).getUrl());
+		assertEquals("nestedValue2", ((StringType) ((Extension) values.get(1)).getValue()).getValueAsString());
 	}
 
 	@Test
@@ -332,6 +388,11 @@ public class FhirTerserDstu3Test {
 		p.addModifierExtension()
 			.setUrl("http://acme.org/modifierExtension")
 			.setValue(new StringType("modifierValue"));
+		p.addExtension()
+			.setUrl("http://acme.org/parentExtension")
+			.addExtension()
+			.setUrl("http://acme.org/childExtension")
+			.setValue(new StringType("nestedValue"));
 
 		System.out.println(ourCtx.newJsonParser().setPrettyPrint(true).encodeResourceToString(p));
 
@@ -351,6 +412,12 @@ public class FhirTerserDstu3Test {
 		assertTrue(extValues.get(0).getValue() instanceof StringType);
 		assertEquals("http://acme.org/modifierExtension", extValues.get(0).getUrl());
 		assertEquals("modifierValue", ((StringType) (extValues.get(0).getValue())).getValueAsString());
+
+		extValues = ourCtx.newTerser().getValues(p, "Patient.extension('http://acme.org/parentExtension').extension('http://acme.org/childExtension')", Extension.class);
+		assertEquals(1, extValues.size());
+		assertTrue(extValues.get(0).getValue() instanceof StringType);
+		assertEquals("http://acme.org/childExtension", extValues.get(0).getUrl());
+		assertEquals("nestedValue", ((StringType) extValues.get(0).getValue()).getValueAsString());
 	}
 
 	@Test
@@ -366,6 +433,11 @@ public class FhirTerserDstu3Test {
 		p.addModifierExtension()
 			.setUrl("http://acme.org/modifierExtension")
 			.setValue(new StringType("modifierValue"));
+		p.addExtension()
+			.setUrl("http://acme.org/parentExtension")
+			.addExtension()
+			.setUrl("http://acme.org/childExtension")
+			.setValue(new StringType("nestedValue"));
 
 		System.out.println(ourCtx.newJsonParser().setPrettyPrint(true).encodeResourceToString(p));
 
@@ -414,6 +486,22 @@ public class FhirTerserDstu3Test {
 		assertTrue(extValues.get(0).getValue() instanceof StringType);
 		assertEquals("http://acme.org/modifierExtension", extValues.get(0).getUrl());
 		assertEquals("modifiedModifierValue", ((StringType) (extValues.get(0).getValue())).getValueAsString());
+
+		extValues = ourCtx.newTerser().getValues(p, "Patient.extension('http://acme.org/parentExtension').extension('http://acme.org/childExtension')", Extension.class);
+		assertEquals(1, extValues.size());
+		assertTrue(extValues.get(0).getValue() instanceof StringType);
+		assertEquals("http://acme.org/childExtension", extValues.get(0).getUrl());
+		assertEquals("nestedValue", ((StringType) extValues.get(0).getValue()).getValueAsString());
+
+		extValues.get(0).setValue(new StringType("modifiedNestedValue"));
+
+		System.out.println(ourCtx.newJsonParser().setPrettyPrint(true).encodeResourceToString(p));
+
+		extValues = ourCtx.newTerser().getValues(p, "Patient.extension('http://acme.org/parentExtension').extension('http://acme.org/childExtension')", Extension.class);
+		assertEquals(1, extValues.size());
+		assertTrue(extValues.get(0).getValue() instanceof StringType);
+		assertEquals("http://acme.org/childExtension", extValues.get(0).getUrl());
+		assertEquals("modifiedNestedValue", ((StringType) extValues.get(0).getValue()).getValueAsString());
 	}
 
 	@Test
@@ -436,6 +524,11 @@ public class FhirTerserDstu3Test {
 		assertEquals(1, extValues.size());
 		assertEquals("http://acme.org/modifierExtension", extValues.get(0).getUrl());
 		assertNull(extValues.get(0).getValue());
+
+		extValues = ourCtx.newTerser().getValues(p, "Patient.extension('http://acme.org/parentExtension').extension('http://acme.org/childExtension')", Extension.class, true);
+		assertEquals(1, extValues.size());
+		assertEquals("http://acme.org/childExtension", extValues.get(0).getUrl());
+		assertNull(extValues.get(0).getValue());
 	}
 
 	@Test
@@ -463,6 +556,18 @@ public class FhirTerserDstu3Test {
 		assertTrue(values.get(0) instanceof Extension);
 		assertEquals("http://acme.org/modifierExtension", ((Extension) values.get(0)).getUrl());
 		assertNull(((Extension) values.get(0)).getValue());
+
+		System.out.println(ourCtx.newJsonParser().setPrettyPrint(true).encodeResourceToString(p));
+
+		values = ourCtx.newTerser().getValues(p, "Patient.extension('http://acme.org/parentExtension').extension('http://acme.org/childExtension')", true);
+
+		System.out.println(ourCtx.newJsonParser().setPrettyPrint(true).encodeResourceToString(p));
+
+		assertEquals(1, values.size());
+		assertTrue(values.get(0) instanceof  IBaseExtension);
+		assertTrue(values.get(0) instanceof Extension);
+		assertEquals("http://acme.org/childExtension", ((Extension) values.get(0)).getUrl());
+		assertNull(((Extension) values.get(0)).getValue());
 	}
 
 	@Test
@@ -478,6 +583,11 @@ public class FhirTerserDstu3Test {
 		p.addModifierExtension()
 			.setUrl("http://acme.org/modifierExtension")
 			.setValue(new StringType("modifierValue"));
+		p.addExtension()
+			.setUrl("http://acme.org/parentExtension")
+			.addExtension()
+			.setUrl("http://acme.org/childExtension")
+			.setValue(new StringType("nestedValue"));
 
 		System.out.println(ourCtx.newJsonParser().setPrettyPrint(true).encodeResourceToString(p));
 
@@ -487,19 +597,26 @@ public class FhirTerserDstu3Test {
 		assertTrue(values.get(0) instanceof BooleanType);
 		assertTrue(((BooleanType) values.get(0)).booleanValue());
 
-		values = ourCtx.newTerser().getValues(p, "Patient.extension('http://acme.org/extension')");
+		values = ourCtx.newTerser().getValues(p, "Patient.extension('http://acme.org/extension')", true);
 		assertEquals(1, values.size());
 		assertTrue(values.get(0) instanceof IBaseExtension);
 		assertTrue(values.get(0) instanceof Extension);
 		assertEquals("http://acme.org/extension", ((Extension) values.get(0)).getUrl());
 		assertEquals("value", ((StringType) ((Extension) values.get(0)).getValue()).getValueAsString());
 
-		values = ourCtx.newTerser().getValues(p, "Patient.modifierExtension('http://acme.org/modifierExtension')");
+		values = ourCtx.newTerser().getValues(p, "Patient.modifierExtension('http://acme.org/modifierExtension')", true);
 		assertEquals(1, values.size());
 		assertTrue(values.get(0) instanceof IBaseExtension);
 		assertTrue(values.get(0) instanceof Extension);
 		assertEquals("http://acme.org/modifierExtension", ((Extension) values.get(0)).getUrl());
 		assertEquals("modifierValue", ((StringType) ((Extension) values.get(0)).getValue()).getValueAsString());
+
+		values = ourCtx.newTerser().getValues(p, "Patient.extension('http://acme.org/parentExtension').extension('http://acme.org/childExtension')", true);
+		assertEquals(1, values.size());
+		assertTrue(values.get(0) instanceof  IBaseExtension);
+		assertTrue(values.get(0) instanceof Extension);
+		assertEquals("http://acme.org/childExtension", ((Extension) values.get(0)).getUrl());
+		assertEquals("nestedValue", ((StringType) ((Extension) values.get(0)).getValue()).getValueAsString());
 	}
 
 	@Test