diff --git a/hapi-fhir-structures-dstu/src/test/java/ca/uhn/fhir/model/primitive/XhtmlDtTest.java b/hapi-fhir-structures-dstu/src/test/java/ca/uhn/fhir/model/primitive/XhtmlDtTest.java
index e0c3328cc31..60cfac54043 100644
--- a/hapi-fhir-structures-dstu/src/test/java/ca/uhn/fhir/model/primitive/XhtmlDtTest.java
+++ b/hapi-fhir-structures-dstu/src/test/java/ca/uhn/fhir/model/primitive/XhtmlDtTest.java
@@ -1,9 +1,12 @@
 package ca.uhn.fhir.model.primitive;
 
-import static org.junit.Assert.assertEquals;
+import static org.hamcrest.Matchers.*;
+import static org.junit.Assert.*;
 
 import org.junit.Test;
 
+import ca.uhn.fhir.parser.DataFormatException;
+
 public class XhtmlDtTest {
 
 	private static final org.slf4j.Logger ourLog = org.slf4j.LoggerFactory.getLogger(XhtmlDtTest.class);
@@ -31,10 +34,9 @@ public class XhtmlDtTest {
 		XhtmlDt x = new XhtmlDt();
 		x.setValueAsString(div);
 
-		
 		XhtmlDt x2 = new XhtmlDt();
 		x2.setValue(x.getValue());
-		
+
 		String actual = x2.getValueAsString();
 
 		ourLog.info("Expected {}", div.replace("\r", "").replace("\n", "\\n"));
@@ -47,10 +49,10 @@ public class XhtmlDtTest {
 	@Test
 	public void testBasicCharacterEntity() {
 		String input = "amp &";
-		
+
 		XhtmlDt x = new XhtmlDt();
 		x.setValueAsString(input);
-		
+
 		assertEquals("<div>amp &amp;</div>", x.getValueAsString());
 	}
 
@@ -62,24 +64,37 @@ public class XhtmlDtTest {
 		assertEquals("<?xml version=\"1.0\" encoding=\"UTF-8\" ?>", x.getValueAsString());
 	}
 
-	
-	
 	@Test
 	public void testCharacterEntities() {
 		String input = "Sect: &sect; uuml: &uuml; &Uuml;";
-		
+
 		XhtmlDt x = new XhtmlDt();
 		x.setValueAsString(input);
 
 		// <div>Sect: § uuml: ü Ü</div>
 		// <div>Sect: &sect; uuml: &uuml; &Uuml;</div>
-		assertEquals("<div>"+input+"</div>", x.getValueAsString());
-		
+		assertEquals("<div>" + input + "</div>", x.getValueAsString());
+
 		XhtmlDt x2 = new XhtmlDt();
 		x2.setValue(x.getValue());
 		assertEquals("<div>Sect: § uuml: ü Ü</div>", x2.getValueAsString());
 
 	}
-	
+
+	/**
+	 * #175
+	 */
+	@Test
+	public void testCharacterEntityUnknown() {
+		String input = "Trade &AAAAA;";
+
+		XhtmlDt x = new XhtmlDt();
+		try {
+			x.setValueAsString(input);
+			fail();
+		} catch (DataFormatException e) {
+			assertThat(e.toString(), containsString("AAAA"));
+		}
+	}
 
 }
diff --git a/hapi-fhir-structures-dstu/src/test/java/ca/uhn/fhir/parser/XmlParserTest.java b/hapi-fhir-structures-dstu/src/test/java/ca/uhn/fhir/parser/XmlParserTest.java
index 47d1060ebcc..29439b60652 100644
--- a/hapi-fhir-structures-dstu/src/test/java/ca/uhn/fhir/parser/XmlParserTest.java
+++ b/hapi-fhir-structures-dstu/src/test/java/ca/uhn/fhir/parser/XmlParserTest.java
@@ -1719,6 +1719,24 @@ public class XmlParserTest {
 
 	}
 
+	/**
+	 * #175
+	 */
+//	@Test
+	public void testParseTextWithUnknownEntity() {
+		String msg = "<Patient xmlns=\"http://hl7.org/fhir\"><text><status value=\"generated\"/>"
+				+ "<div xmlns=\"http://www.w3.org/1999/xhtml\">Trade &trade;</div></text></Patient>";
+		Patient pt = ourCtx.newXmlParser().parseResource(Patient.class, msg);
+
+		ourLog.info(pt.getText().getDiv().getValueAsString());
+		assertThat(pt.getText().getDiv().getValueAsString(), containsString("Trade ™"));
+		
+		String enc = ourCtx.newXmlParser().encodeResourceToString(pt);
+		ourLog.info(enc);
+		assertThat(enc, containsString("Trade ™"));
+
+	}
+
 	@Test
 	public void testParseWithIncorrectResourceType() {
 		String input = "<Patient><foo><bar/></foo><name><family value=\"AAA\"/></name></Patient>";