diff --git a/src/daemon/name-server.cpp b/src/daemon/name-server.cpp
index ab3356c..70288ec 100644
--- a/src/daemon/name-server.cpp
+++ b/src/daemon/name-server.cpp
@@ -103,14 +103,11 @@
   }
   else {
     // no record, construct NACK
-    Block block = makeNonNegativeIntegerBlock(tlv::NdnsType, NDNS_NACK);
-    MetaInfo info;
-    info.addAppMetaInfo(block);
-    info.setFreshnessPeriod(this->getContentFreshness());
     Name name = interest.getName();
     name.appendVersion();
     shared_ptr<Data> answer = make_shared<Data>(name);
-    answer->setMetaInfo(info);
+    answer->setFreshnessPeriod(this->getContentFreshness());
+    answer->setContentType(NDNS_NACK);
 
     m_keyChain.sign(*answer, m_certName);
     NDNS_LOG_TRACE("answer query with NDNS-NACK: " << answer->getName());
@@ -168,14 +165,11 @@
   rrset.setLabel(re.rrLabel);
   rrset.setType(re.rrType);
 
-  Block ndnsType = makeNonNegativeIntegerBlock(::ndn::ndns::tlv::NdnsType, NDNS_RESP);
-  MetaInfo info;
-  info.addAppMetaInfo(ndnsType);
-  info.setFreshnessPeriod(this->getContentFreshness());
   Name name = interest->getName();
   name.appendVersion();
   shared_ptr<Data> answer = make_shared<Data>(name);
-  answer->setMetaInfo(info);
+  answer->setFreshnessPeriod(this->getContentFreshness());
+  answer->setContentType(NDNS_RESP);
 
   Block blk(ndn::ndns::tlv::RrData);
   try {
diff --git a/src/daemon/rrset-factory.cpp b/src/daemon/rrset-factory.cpp
index b1bbf90..a75c650 100644
--- a/src/daemon/rrset-factory.cpp
+++ b/src/daemon/rrset-factory.cpp
@@ -153,7 +153,7 @@
     link.addDelegation(i.first, i.second);
   }
 
-  setMetaInfo(link);
+  setContentType(link, NDNS_LINK, ttl);
   sign(link);
   rrset.setData(link.wireEncode());
 
@@ -188,7 +188,7 @@
   Data data(name);
   data.setContent(wireEncode(rrs));
 
-  setMetaInfo(data);
+  setContentType(data, NDNS_RESP, ttl);
   sign(data);
   rrset.setData(data.wireEncode());
 
@@ -216,7 +216,7 @@
   Data data(name);
   data.setContent(cert.wireEncode());
 
-  setMetaInfo(data);
+  setContentType(data, NDNS_BLOB, ttl);
   sign(data);
   rrset.setData(data.wireEncode());
 
@@ -231,12 +231,11 @@
 }
 
 void
-RrsetFactory::setMetaInfo(Data& data)
+RrsetFactory::setContentType(Data& data, NdnsContentType contentType,
+                             const time::seconds& ttl)
 {
-  MetaInfo metaInfo = data.getMetaInfo();
-  metaInfo.addAppMetaInfo(makeNonNegativeIntegerBlock(ndns::tlv::NdnsType,
-                                                      NDNS_RESP));
-  data.setMetaInfo(metaInfo);
+  data.setContentType(contentType);
+  data.setFreshnessPeriod(ttl);
 }
 
 template<encoding::Tag TAG>
@@ -273,7 +272,7 @@
   std::vector<std::string> txts;
   wire.parse();
 
-  for (const auto& e: wire.elements()) {
+  for (const auto& e : wire.elements()) {
     txts.push_back(std::string(reinterpret_cast<const char*>(e.value()),
                                e.value_size()));
   }
diff --git a/src/daemon/rrset-factory.hpp b/src/daemon/rrset-factory.hpp
index 732f0a7..8318bb8 100644
--- a/src/daemon/rrset-factory.hpp
+++ b/src/daemon/rrset-factory.hpp
@@ -24,6 +24,7 @@
 #include "rrset.hpp"
 #include "logger.hpp"
 #include "daemon/db-mgr.hpp"
+#include "ndns-enum.hpp"
 
 #include <ndn-cxx/link.hpp>
 #include <ndn-cxx/security/key-chain.hpp>
@@ -106,8 +107,8 @@
   void
   sign(Data& data);
 
-  void
-  setMetaInfo(Data& data);
+  void setContentType(Data& data, NdnsContentType contentType,
+                      const time::seconds& ttl);
 
 private:
   KeyChain& m_keyChain;