diff --git a/src/netanim/model/animation-interface.cc b/src/netanim/model/animation-interface.cc
--- a/src/netanim/model/animation-interface.cc
+++ b/src/netanim/model/animation-interface.cc
@@ -2002,8 +2002,35 @@
   std::ostringstream oss;
   oss << std::setprecision (10);
   oss << value;
+  const char *attribute_char = oss.str().c_str();
   m_elementString += attribute.c_str ();
-  m_elementString += "=\"" + oss.str () + "\" ";
+  m_elementString += "=\"";
+  while (*attribute_char)
+  {
+	  switch(*attribute_char)
+	  {
+		  case '&':
+			  m_elementString += "&amp;";
+		  	  break;
+		  case '\"':
+			  m_elementString += "&quot;";
+			  break;
+		  case '\'':
+			  m_elementString += "&apos;";
+			  break;
+		  case '<':
+			  m_elementString += "&lt;";
+			  break;
+		  case '>':
+			  m_elementString += "&gt;";
+			  break;
+		  default:
+			  m_elementString += *attribute_char;
+			  break;
+	  }
+	  attribute_char++;
+  }
+  m_elementString += "\" ";
 }
 
 void