diff --git a/six/modules/c++/cphd/include/cphd/CPHDXMLControl.h b/six/modules/c++/cphd/include/cphd/CPHDXMLControl.h
index f3ef81da7..2a6b619cd 100644
--- a/six/modules/c++/cphd/include/cphd/CPHDXMLControl.h
+++ b/six/modules/c++/cphd/include/cphd/CPHDXMLControl.h
@@ -29,6 +29,7 @@
 #include <std/filesystem>
 #include <vector>
 #include <std/string>
+#include <map>
 
 #include <scene/sys_Conf.h>
 #include <xml/lite/Element.h>
@@ -145,6 +146,7 @@ class CPHDXMLControl
 
     //! \return Suported version to uri mapping
     static std::unordered_map<std::string, xml::lite::Uri> getVersionUriMap();
+    static void getVersionUriMap(std::map<Version, xml::lite::Uri>&);
 
 protected:
     logging::Logger *mLog = nullptr;
@@ -179,7 +181,7 @@ class CPHDXMLControl
     getParser(const xml::lite::Uri&) const;
 
     // Given the URI get associated version
-    std::string uriToVersion(const xml::lite::Uri&) const;
+    Version uriToVersion(const xml::lite::Uri&) const;
 };
 }
 
diff --git a/six/modules/c++/cphd/include/cphd/FileHeader.h b/six/modules/c++/cphd/include/cphd/FileHeader.h
index e678635f8..09f4c776e 100644
--- a/six/modules/c++/cphd/include/cphd/FileHeader.h
+++ b/six/modules/c++/cphd/include/cphd/FileHeader.h
@@ -28,6 +28,7 @@
 
 #include <io/SeekableStreams.h>
 #include <cphd/BaseFileHeader.h>
+#include <cphd/Types.h>
 
 namespace cphd
 {
@@ -36,10 +37,10 @@ namespace cphd
  *
  *  \brief Stores CPHD file header information
  */
-class FileHeader : public BaseFileHeader
+class FileHeader final : public BaseFileHeader
 {
 public:
-    static const char DEFAULT_VERSION[];
+    static const std::string DEFAULT_VERSION;
 
     /*
      *  \func FileHeader
@@ -96,6 +97,7 @@ class FileHeader : public BaseFileHeader
      *
      */
     void setVersion(const std::string& version);
+    void setVersion(Version);
 
     /*
      *  \func set
diff --git a/six/modules/c++/cphd/include/cphd/Metadata.h b/six/modules/c++/cphd/include/cphd/Metadata.h
index b7de4ea0a..1cca99a41 100644
--- a/six/modules/c++/cphd/include/cphd/Metadata.h
+++ b/six/modules/c++/cphd/include/cphd/Metadata.h
@@ -80,9 +80,11 @@ struct Metadata final : MetadataBase
 
     //! Get CPHD version
     std::string getVersion() const;
+    void getVersion(Version&) const;
 
     //! Set CPHD version
     void setVersion(const std::string& version);
+    void setVersion(Version);
 
     //!  CollectionInfo block.  Contains the general collection information
     //!  CPHD can use the SICD Collection Information block directly
@@ -152,7 +154,7 @@ struct Metadata final : MetadataBase
 private:
 
     //! Stores file Version
-    std::string mVersion;
+    Version mVersion;
 };
 
 //! Ostream operator
diff --git a/six/modules/c++/cphd/include/cphd/Types.h b/six/modules/c++/cphd/include/cphd/Types.h
index 6eab11477..a86a7b005 100644
--- a/six/modules/c++/cphd/include/cphd/Types.h
+++ b/six/modules/c++/cphd/include/cphd/Types.h
@@ -91,6 +91,15 @@ typedef six::CollectionInformation CollectionInformation;
 typedef six::GeoInfo GeoInfo;
 
 typedef six::MatchInformation MatchInformation;
+
+enum class Version
+{
+    v100, //  {"1.0.0", xml::lite::Uri("urn:CPHD:1.0.0")},
+    v101, // {"1.0.1", xml::lite::Uri("http://api.nsgreg.nga.mil/schema/cphd/1.0.1")},
+    v110, // {"1.1.0", xml::lite::Uri("http://api.nsgreg.nga.mil/schema/cphd/1.1.0")}
+};
+std::string to_string(Version); // "1.0.0", "1.0.1", "1.1.0"
+
 }
 
 
diff --git a/six/modules/c++/cphd/source/CPHDWriter.cpp b/six/modules/c++/cphd/source/CPHDWriter.cpp
index 4d8ad2d9a..aafbe4ad8 100644
--- a/six/modules/c++/cphd/source/CPHDWriter.cpp
+++ b/six/modules/c++/cphd/source/CPHDWriter.cpp
@@ -76,8 +76,9 @@ void CPHDWriter::writeMetadata(size_t supportSize,
 {
     const auto xmlMetadata(CPHDXMLControl().toXMLString(mMetadata, mSchemaPaths));
 
-    // update header version, or remains default if unset
-    mHeader.setVersion(mMetadata.getVersion());
+    Version cphdVersion;
+    mMetadata.getVersion(cphdVersion);
+    mHeader.setVersion(cphdVersion);
 
     // update classification and release info
     if (!six::Init::isUndefined(
diff --git a/six/modules/c++/cphd/source/CPHDXMLControl.cpp b/six/modules/c++/cphd/source/CPHDXMLControl.cpp
index 9aa6bff7b..c25350aa8 100644
--- a/six/modules/c++/cphd/source/CPHDXMLControl.cpp
+++ b/six/modules/c++/cphd/source/CPHDXMLControl.cpp
@@ -24,8 +24,9 @@
 #include <set>
 #include <unordered_map>
 #include <algorithm>
-#include <std/memory>
+#include <memory>
 #include <iterator>
+#include <stdexcept>
 
 #include <io/StringStream.h>
 #include <logging/NullLogger.h>
@@ -103,21 +104,47 @@ std::unique_ptr<xml::lite::Document> CPHDXMLControl::toXML(
     return doc;
 }
 
-std::unordered_map<std::string, xml::lite::Uri> CPHDXMLControl::getVersionUriMap()
+static std::unordered_map<std::string, xml::lite::Uri> makeVersionUriMap_()
 {
-    return {
-        {"1.0.0", xml::lite::Uri("urn:CPHD:1.0.0")},
-        {"1.0.1", xml::lite::Uri("http://api.nsgreg.nga.mil/schema/cphd/1.0.1")},
-        {"1.1.0", xml::lite::Uri("http://api.nsgreg.nga.mil/schema/cphd/1.1.0")}
+    std::map<Version, xml::lite::Uri> result;
+    CPHDXMLControl::getVersionUriMap(result);
+
+    std::unordered_map<std::string, xml::lite::Uri> retval;
+    for (const auto& version_and_uri : result)
+    {
+        retval[to_string(version_and_uri.first)] = version_and_uri.second;
+    }
+    return retval;
+}
+std::unordered_map<std::string, xml::lite::Uri> CPHDXMLControl::getVersionUriMap() // for existing code
+{
+    static const auto retval = makeVersionUriMap_();
+    return retval;
+}
+static std::map<Version, xml::lite::Uri> getVersionUriMap_()
+{
+    static const std::map<Version, xml::lite::Uri> retval = {
+        {Version::v100, xml::lite::Uri("urn:CPHD:1.0.0")},
+        {Version::v101, xml::lite::Uri("http://api.nsgreg.nga.mil/schema/cphd/1.0.1")},
+        {Version::v110, xml::lite::Uri("http://api.nsgreg.nga.mil/schema/cphd/1.1.0")}
     };
+    return retval;
+}
+void CPHDXMLControl::getVersionUriMap(std::map<Version, xml::lite::Uri>& result)
+{
+    result = getVersionUriMap_();
 }
 
 std::unique_ptr<xml::lite::Document> CPHDXMLControl::toXMLImpl(const Metadata& metadata)
 {
-    const auto versionUriMap = getVersionUriMap();
-    if (versionUriMap.find(metadata.getVersion()) != versionUriMap.end())
+    Version cphdVersion;
+    metadata.getVersion(cphdVersion);
+
+    static const auto versionUriMap = getVersionUriMap_();
+    const auto it = versionUriMap.find(cphdVersion);
+    if (it != versionUriMap.end())
     {
-      return getParser(versionUriMap.find(metadata.getVersion())->second)->toXML(metadata);
+      return getParser(it->second)->toXML(metadata);
     }
     std::ostringstream ostr;
     ostr << "The version " << metadata.getVersion() << " is invalid. "
@@ -180,9 +207,9 @@ CPHDXMLControl::getParser(const xml::lite::Uri& uri) const
     return std::make_unique<CPHDXMLParser>(uri.value, false, mLog);
 }
 
-std::string CPHDXMLControl::uriToVersion(const xml::lite::Uri& uri) const
+Version CPHDXMLControl::uriToVersion(const xml::lite::Uri& uri) const
 {
-    const auto versionUriMap = getVersionUriMap();
+    static const auto versionUriMap = getVersionUriMap_();
     for (const auto& p : versionUriMap)
     {
         if (p.second == uri)
@@ -198,3 +225,16 @@ std::string CPHDXMLControl::uriToVersion(const xml::lite::Uri& uri) const
 }
 
 }
+
+std::string cphd::to_string(Version siddVersion)
+{
+    // Match existing version strings, see CPHDXMLControl::getVersionUriMap
+    switch (siddVersion)
+    {
+    case Version::v100: return "1.0.0";
+    case Version::v101: return "1.0.1";
+    case Version::v110: return "1.1.0";
+    default: break;
+    }
+    throw std::logic_error("Unkown 'Version' value.");
+}
\ No newline at end of file
diff --git a/six/modules/c++/cphd/source/FileHeader.cpp b/six/modules/c++/cphd/source/FileHeader.cpp
index 501bca29c..db2a5a89a 100644
--- a/six/modules/c++/cphd/source/FileHeader.cpp
+++ b/six/modules/c++/cphd/source/FileHeader.cpp
@@ -27,10 +27,11 @@
 #include <except/Exception.h>
 #include <str/Manip.h>
 #include <cphd/FileHeader.h>
+#include <cphd/Types.h>
 
 namespace cphd
 {
-const char FileHeader::DEFAULT_VERSION[] = "1.0.1";
+const std::string FileHeader::DEFAULT_VERSION = to_string(Version::v101);
 
 FileHeader::FileHeader() :
     mVersion(DEFAULT_VERSION),
@@ -181,6 +182,10 @@ void FileHeader::setVersion(const std::string& version)
 {
     mVersion = version;
 }
+void FileHeader::setVersion(Version version)
+{
+    setVersion(to_string(version));
+}
 
 size_t FileHeader::set(int64_t xmlBlockSize,
                        int64_t supportBlockSize,
diff --git a/six/modules/c++/cphd/source/Metadata.cpp b/six/modules/c++/cphd/source/Metadata.cpp
index 271a5ae9a..8b79b5835 100644
--- a/six/modules/c++/cphd/source/Metadata.cpp
+++ b/six/modules/c++/cphd/source/Metadata.cpp
@@ -21,13 +21,15 @@
  */
 #include <cphd/Metadata.h>
 
+#include <stdexcept>
+
 namespace cphd
 {
 
 Metadata::Metadata()
 {
   // Default version defined in cphd::FileHeader
-  mVersion = FileHeader::DEFAULT_VERSION;
+  setVersion(FileHeader::DEFAULT_VERSION);
 }
 
 size_t Metadata::getNumChannels() const
@@ -67,9 +69,33 @@ DomainType Metadata::getDomainType() const
 
 std::string Metadata::getVersion() const
 {
-    return mVersion;
+    return to_string(mVersion);
+}
+void Metadata::getVersion(Version& version) const
+{
+    version = mVersion;
 }
+
 void Metadata::setVersion(const std::string& version)
+{
+    if (version == "1.0.0")
+    {
+        setVersion(Version::v100);
+    }
+    else if (version == "1.0.1")
+    {
+        setVersion(Version::v101);
+    }
+    else if (version == "1.1.0")
+    {
+        setVersion(Version::v110);
+    }
+    else
+    {
+        throw std::invalid_argument("Unknown version string: " + version);
+    }
+}
+void Metadata::setVersion(Version version)
 {
     mVersion = version;
 }