diff --git a/src/image/Image.cc b/src/image/Image.cc
index 20c5ea1604..af74077a48 100644
--- a/src/image/Image.cc
+++ b/src/image/Image.cc
@@ -324,7 +324,8 @@ error_common:
 
 string& Image::to_xml(string& xml) const
 {
-    string          aux_str;
+    string          template_xml;
+    string          perms_xml;
     ostringstream   oss;
 
     oss <<
@@ -335,7 +336,7 @@ string& Image::to_xml(string& xml) const
             "<UNAME>"          << uname           << "</UNAME>"       << 
             "<GNAME>"          << gname           << "</GNAME>"       <<
             "<NAME>"           << name            << "</NAME>"        <<
-            perms_to_xml(aux_str)                                     <<
+            perms_to_xml(perms_xml)                                   <<
             "<TYPE>"           << type            << "</TYPE>"        <<
             "<PUBLIC>"         << public_obj      << "</PUBLIC>"      <<
             "<PERSISTENT>"     << persistent_img  << "</PERSISTENT>"  <<
@@ -346,7 +347,7 @@ string& Image::to_xml(string& xml) const
             "<SIZE>"           << size_mb         << "</SIZE>"        <<
             "<STATE>"          << state           << "</STATE>"       <<
             "<RUNNING_VMS>"    << running_vms     << "</RUNNING_VMS>" <<
-            obj_template->to_xml(aux_str)                        <<
+            obj_template->to_xml(template_xml)                        <<
         "</IMAGE>";
 
     xml = oss.str();
diff --git a/src/vm/VirtualMachine.cc b/src/vm/VirtualMachine.cc
index 330f59350c..96b9c1f42b 100644
--- a/src/vm/VirtualMachine.cc
+++ b/src/vm/VirtualMachine.cc
@@ -1237,7 +1237,9 @@ string& VirtualMachine::to_xml_extended(string& xml) const
 
 string& VirtualMachine::to_xml_extended(string& xml, bool extended) const
 {
-    string          aux_str;
+    string template_xml;
+    string history_xml;
+    string perm_xml;
     ostringstream	oss;
 
     oss << "<VM>"
@@ -1247,7 +1249,7 @@ string& VirtualMachine::to_xml_extended(string& xml, bool extended) const
         << "<UNAME>"     << uname     << "</UNAME>" 
         << "<GNAME>"     << gname     << "</GNAME>" 
         << "<NAME>"      << name      << "</NAME>"
-        << perms_to_xml(aux_str)
+        << perms_to_xml(perm_xml)
         << "<LAST_POLL>" << last_poll << "</LAST_POLL>"
         << "<STATE>"     << state     << "</STATE>"
         << "<LCM_STATE>" << lcm_state << "</LCM_STATE>"
@@ -1258,7 +1260,7 @@ string& VirtualMachine::to_xml_extended(string& xml, bool extended) const
         << "<CPU>"       << cpu       << "</CPU>"
         << "<NET_TX>"    << net_tx    << "</NET_TX>"
         << "<NET_RX>"    << net_rx    << "</NET_RX>"
-        << obj_template->to_xml(aux_str);
+        << obj_template->to_xml(template_xml);
 
     if ( hasHistory() )
     {
@@ -1268,12 +1270,12 @@ string& VirtualMachine::to_xml_extended(string& xml, bool extended) const
         {
             for (unsigned int i=0; i < history_records.size(); i++)
             {
-                oss << history_records[i]->to_xml(aux_str);
+                oss << history_records[i]->to_xml(history_xml);
             }
         }
         else
         {
-            oss << history->to_xml(aux_str);
+            oss << history->to_xml(history_xml);
         }
 
         oss << "</HISTORY_RECORDS>";
diff --git a/src/vm_template/VMTemplate.cc b/src/vm_template/VMTemplate.cc
index e2e174c374..179363a784 100644
--- a/src/vm_template/VMTemplate.cc
+++ b/src/vm_template/VMTemplate.cc
@@ -206,7 +206,8 @@ error_common:
 string& VMTemplate::to_xml(string& xml) const
 {
     ostringstream   oss;
-    string          aux_str;
+    string          template_xml;
+    string          perm_str;
 
     oss << "<VMTEMPLATE>"
             << "<ID>"       << oid        << "</ID>"
@@ -215,10 +216,10 @@ string& VMTemplate::to_xml(string& xml) const
             << "<UNAME>"    << uname      << "</UNAME>" 
             << "<GNAME>"    << gname      << "</GNAME>" 
             << "<NAME>"     << name       << "</NAME>"
-            << perms_to_xml(aux_str)
+            << perms_to_xml(perm_str)
             << "<PUBLIC>"   << public_obj << "</PUBLIC>"
             << "<REGTIME>"  << regtime    << "</REGTIME>"
-            << obj_template->to_xml(aux_str)
+            << obj_template->to_xml(template_xml)
         << "</VMTEMPLATE>";
 
     xml = oss.str();
diff --git a/src/vnm/VirtualNetwork.cc b/src/vnm/VirtualNetwork.cc
index 7e2859f63e..bd545215a0 100644
--- a/src/vnm/VirtualNetwork.cc
+++ b/src/vnm/VirtualNetwork.cc
@@ -464,7 +464,10 @@ string& VirtualNetwork::to_xml_extended(string& xml) const
 string& VirtualNetwork::to_xml_extended(string& xml, bool extended) const
 {
     ostringstream   os;
-    string          aux_str;
+
+    string template_xml;
+    string leases_xml;
+    string perm_str;
 
     // Total leases is the number of used leases.
     int total_leases = 0;
@@ -482,7 +485,7 @@ string& VirtualNetwork::to_xml_extended(string& xml, bool extended) const
             "<UNAME>"  << uname  << "</UNAME>" << 
             "<GNAME>"  << gname  << "</GNAME>" <<
             "<NAME>"   << name   << "</NAME>"  <<
-            perms_to_xml(aux_str)              <<
+            perms_to_xml(perm_str)              <<
             "<TYPE>"   << type   << "</TYPE>"  <<
             "<BRIDGE>" << bridge << "</BRIDGE>"<<
             "<VLAN>"   << vlan   << "</VLAN>";
@@ -522,14 +525,14 @@ string& VirtualNetwork::to_xml_extended(string& xml, bool extended) const
 
     os  <<  "<PUBLIC>"      << public_obj   << "</PUBLIC>"      <<
             "<TOTAL_LEASES>"<< total_leases << "</TOTAL_LEASES>"<<
-            obj_template->to_xml(aux_str);
+            obj_template->to_xml(template_xml);
 
     if (extended)
     {
         if (leases != 0)
         {
             os <<   "<LEASES>"                  <<
-                    leases->to_xml(aux_str)     <<
+                    leases->to_xml(leases_xml)     <<
                     "</LEASES>";
         }
         else