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diff --git a/lib/gras_impl/query_common.hpp b/lib/gras_impl/query_common.hpp
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+++ b/lib/gras_impl/query_common.hpp
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+// Copyright (C) by Josh Blum. See LICENSE.txt for licensing information.
+
+#ifndef INCLUDED_LIBGRAS_IMPL_QUERY_COMMON_HPP
+#define INCLUDED_LIBGRAS_IMPL_QUERY_COMMON_HPP
+
+#include <PMC/PMC.hpp>
+#include <boost/property_tree/ptree.hpp>
+#include <vector>
+
+// misc functions used in the implementation cpp files
+
+namespace gras
+{
+    PMCC ptree_to_pmc(const boost::property_tree::ptree &value, const std::type_info &hint);
+    boost::property_tree::ptree pmc_to_ptree(const PMCC &value);
+
+    boost::property_tree::ptree json_to_ptree(const std::string &s);
+    std::string ptree_to_json(const boost::property_tree::ptree &p);
+}
+
+#endif /*INCLUDED_LIBGRAS_IMPL_QUERY_COMMON_HPP*/