diff --git a/mcc_deser.h b/mcc_deser.h
new file mode 100644
index 0000000..de7ffd4
--- /dev/null
+++ b/mcc_deser.h
@@ -0,0 +1,301 @@
+#pragma once
+
+#include <algorithm>
+
+#include "mcc_epoch.h"
+#include "mcc_serialization_common.h"
+
+namespace mcc::impl
+{
+
+enum class MccDeserializerErrorCode : int {
+    ERROR_OK,
+    ERROR_UNDERLYING_DESERIALIZER,
+    ERROR_INVALID_SERIALIZED_VALUE,
+    ERROR_COORD_TRANSFORM
+};
+
+}  // namespace mcc::impl
+
+
+
+namespace std
+{
+
+template <>
+class is_error_code_enum<mcc::impl::MccDeserializerErrorCode> : public true_type
+{
+};
+
+}  // namespace std
+
+
+namespace mcc::impl
+{
+
+
+// error category
+struct MccDeserializerCategory : public std::error_category {
+    MccDeserializerCategory() : std::error_category() {}
+
+    const char* name() const noexcept
+    {
+        return "MCC-DESERIALIZER-ERR-CATEGORY";
+    }
+
+    std::string message(int ec) const
+    {
+        MccDeserializerErrorCode err = static_cast<MccDeserializerErrorCode>(ec);
+
+        switch (err) {
+            case MccDeserializerErrorCode::ERROR_OK:
+                return "OK";
+            case MccDeserializerErrorCode::ERROR_UNDERLYING_DESERIALIZER:
+                return "error returned by underlying deserializer";
+            case MccDeserializerErrorCode::ERROR_INVALID_SERIALIZED_VALUE:
+                return "invalid serialized value";
+            case MccDeserializerErrorCode::ERROR_COORD_TRANSFORM:
+                return "coordinates transformation error";
+            default:
+                return "UNKNOWN";
+        }
+    }
+
+    static const MccDeserializerCategory& get()
+    {
+        static const MccDeserializerCategory constInst;
+        return constInst;
+    }
+};
+
+
+inline std::error_code make_error_code(MccDeserializerErrorCode ec)
+{
+    return std::error_code(static_cast<int>(ec), MccDeserializerCategory::get());
+}
+
+
+
+/*    BASE DESERIALIZER CLASS (FOR IMPLEMENTATIONS BELOW)    */
+
+struct MccDeserializerBase : mcc_deserializer_interface_t<MccError> {
+    using typename mcc_deserializer_interface_t<MccError>::error_t;
+
+    virtual ~MccDeserializerBase() = default;
+
+
+protected:
+    MccDeserializerBase() = default;
+
+    //
+    // empty == true, if the 'input' is empty or if all elements consist of only spaces
+    //
+    static std::vector<std::string_view> splitValueIntoElements(traits::mcc_input_char_range auto const& input,
+                                                                mcc_serialization_params_c auto const& params,
+                                                                bool& empty)
+    {
+        static_assert(std::ranges::contiguous_range<decltype(input)>, "NOT IMPLEMENTED FOR NON-CONTIGUIUS RANGES!!!");
+
+        std::vector<std::string_view> res;
+
+        if (std::ranges::size(input)) {
+            empty = true;
+
+            std::ranges::for_each(std::views::split(input, params.elem_delim), [&res, &empty](auto const& el) {
+                std::back_inserter(res) = utils::trimSpaces(std::string_view{el.begin(), el.end()});
+                if (empty && res.back().size()) {
+                    empty = false;
+                }
+            });
+        } else {
+            empty = true;
+        }
+
+        return res;
+    }
+
+    template <typename VT, std::ranges::output_range<VT> R, typename... DeserParamsT>
+    static error_t deserializingRange(mcc_deserializer_c auto& dsr,
+                                      traits::mcc_input_char_range auto const& input,
+                                      R& r,
+                                      mcc_serialization_params_c auto const& params)
+    {
+        if (std::ranges::size(input) == 0) {  // ignore an empty input, just return empty range?!!
+            r = R{};
+            return MccDeserializerErrorCode::ERROR_OK;
+        }
+
+        auto r_str = std::views::split(input, params.seq_delim);
+        VT val;
+
+        auto it = r.begin();
+        for (auto const& el : r_str) {
+            auto err = dsr(el, val, std::forward<DeserParamsT>(params)...);
+            if (err) {
+                return mcc_deduced_err(err, MccDeserializerErrorCode::ERROR_UNDERLYING_DESERIALIZER);
+            }
+
+            if (it == r.end()) {
+                std::back_inserter(r) = val;
+                it = r.end();
+            } else {
+                *it = val;
+                ++it;
+            }
+        }
+
+        return MccDeserializerErrorCode::ERROR_OK;
+    }
+};
+
+
+/*    MAIN (FALLBACK) TEMPLATED IMPLEMENTATION    */
+
+
+template <typename VT>
+struct MccDeserializer : MccDeserializerBase {
+    static constexpr std::string_view deserializerName{"MCC-FALLBACK-DESERIALIZER"};
+
+    virtual ~MccDeserializer() = default;
+
+
+    template <mcc_serialization_params_c ParamsT = mcc_serialization_params_t>
+    error_t operator()(traits::mcc_input_char_range auto const& input,
+                       VT& value,
+                       ParamsT const& params = mcc_serialization_params_t{})
+    {
+        if constexpr (std::is_arithmetic_v<VT>) {
+            auto v = mcc::utils::numFromStr<VT>(utils::trimSpaces(input));
+            if (!v.has_value()) {
+                return MccDeserializerErrorCode::ERROR_INVALID_SERIALIZED_VALUE;
+            }
+
+            value = v.value();
+        } else if constexpr (mcc::traits::mcc_output_char_range<VT>) {
+            VT r;
+            if constexpr (traits::mcc_array_c<VT>) {
+                size_t N =
+                    std::ranges::size(r) <= std::ranges::size(input) ? std::ranges::size(r) : std::ranges::size(input);
+
+                for (size_t i = 0; i < N; ++i) {
+                    r[i] = input[i];
+                }
+                if (std::ranges::size(r) > N) {
+                    for (size_t i = N; i < std::ranges::size(r); ++i) {
+                        r[i] = '\0';
+                    }
+                }
+            } else {
+                std::ranges::copy(input, std::back_inserter(r));
+            }
+
+            value = r;
+        } else if constexpr (std::ranges::range<VT>) {
+            using el_t = std::ranges::range_value_t<VT>;
+
+            static_assert(std::ranges::output_range<VT, el_t>, "INVALID RANGE TYPE!!!");
+
+            // no reference or constants allowed
+            static_assert(std::is_reference_v<el_t> || std::is_const_v<el_t>, "INVALID RANGE ELEMENT TYPE!!!");
+
+            MccDeserializer<el_t> dsr;
+            return deserializingRange<el_t>(dsr, input, value, params);
+        } else if constexpr (traits::mcc_time_duration_c<VT>) {
+            typename VT::rep vd;
+
+            MccDeserializer<typename VT::rep> dsr;
+
+            auto err = dsr(trimSpaces(input), vd, params);
+            if (err) {
+                return mcc_deduced_err(err, MccDeserializerErrorCode::ERROR_UNDERLYING_DESERIALIZER);
+            }
+
+            value = VT{vd};
+        } else {
+            static_assert(false, "UNSUPPORTED VALUE TYPE!!!");
+        }
+
+
+        return MccDeserializerErrorCode::ERROR_OK;
+    }
+};
+
+
+/*                          SPECIALIZATION FOR THE SOME CONCEPTS                            */
+
+template <mcc_coord_epoch_c VT>
+struct MccDeserializer<VT> : MccDeserializerBase {
+    static constexpr std::string_view deserializerName{"MCC-COORD-EPOCH-DESERIALIZER"};
+
+    template <mcc_serialization_params_c ParamsT = mcc_serialization_params_t>
+    error_t operator()(traits::mcc_input_char_range auto const& input,
+                       VT& value,
+                       ParamsT const& params = mcc_serialization_params_t{})
+    {
+        bool ok = value.fromCharRange(input);
+        if (!ok) {
+            return MccDeserializerErrorCode::ERROR_INVALID_SERIALIZED_VALUE;
+        }
+
+        return MccDeserializerErrorCode::ERROR_OK;
+    }
+};
+
+
+
+template <typename VT>
+    requires(!std::is_arithmetic_v<VT> && mcc_angle_c<VT>)
+struct MccDeserializer<VT> : MccDeserializerBase {
+    static constexpr std::string_view deserializerName{"MCC-ANGLE-DESERIALIZER"};
+
+    template <mcc_serialization_params_c ParamsT = mcc_serialization_params_t>
+    error_t operator()(traits::mcc_input_char_range auto const& input,
+                       VT& value,
+                       ParamsT const& params = mcc_serialization_params_t{})
+    {
+        bool hms = params.angle_format == MccSerializedAngleFormat::MCC_SERIALIZED_FORMAT_SXGM_HOURS;
+
+        auto res = utils::parsAngleString(input, hms);
+        if (res) {  // returned angle is in degrees!!!
+            value = res.value() * MCC_DEGRESS_TO_RADS;
+        } else {
+            return MccDeserializerErrorCode::ERROR_INVALID_SERIALIZED_VALUE;
+        }
+
+        return MccDeserializerErrorCode::ERROR_OK;
+    }
+};
+
+
+template <mcc_skypoint_c VT>
+struct MccDeserializer<VT> : MccDeserializerBase {
+    static constexpr std::string_view deserializerName{"MCC-SKYPOINT-DESERIALIZER"};
+
+    template <mcc_serialization_params_c ParamsT = mcc_serialization_params_t>
+    error_t operator()(traits::mcc_input_char_range auto const& input,
+                       VT& value,
+                       ParamsT const& params = mcc_serialization_params_t{})
+    {
+        // valid format: X<elem-delim>Y[<elem-delim>TIME-POINT<elem-delim>PAIR-KIND]
+        //               X<elem-delim>Y (assumed RADEC_ICRS and J2000.0 epoch)
+
+        bool empty;
+
+        auto elems = MccDeserializerBase::splitValueIntoElements(input, params, empty);
+
+        if (empty || (elems.size() < 2) || (elems.size() == 3)) {
+            return MccDeserializerErrorCode::ERROR_INVALID_SERIALIZED_VALUE;
+        }
+
+        MccCoordPairKind pair_kind{MccCoordPairKind::COORDS_KIND_RADEC_ICRS};
+        MccCelestialCoordEpoch epoch;  // J2000.0
+
+        MccAngle x, y;
+        MccDeserializer<MccAngle> dsr_ang;
+
+        typename MccDeserializer<MccAngle>::error_t dsr_err;
+    }
+};
+
+
+}  // namespace mcc::impl
diff --git a/mcc_ser.h b/mcc_ser.h
index a381d4e..8a1df2e 100644
--- a/mcc_ser.h
+++ b/mcc_ser.h
@@ -158,7 +158,7 @@ template <typename VT>
 struct MccSerializer : MccSerializerBase {
     constexpr static std::string_view serializerName{"MCC-FALLBACK-SERIALIZER"};
 
-    template <typename ParamsT = mcc_serialization_params_t>
+    template <mcc_serialization_params_c ParamsT = mcc_serialization_params_t>
     error_t operator()(traits::mcc_output_char_range auto& output,
                        VT const& value,
                        ParamsT const& params = mcc_serialization_params_t{})
@@ -207,7 +207,7 @@ struct MccSerializer<VT> : MccSerializerBase {
 
     constexpr static std::string_view serializerName{"MCC-SYSTIME-SERIALIZER"};
 
-    template <typename ParamsT = mcc_serialization_params_t>
+    template <mcc_serialization_params_c ParamsT = mcc_serialization_params_t>
     error_t operator()(traits::mcc_output_char_range auto& output,
                        VT const& value,
                        ParamsT const& params = mcc_serialization_params_t{})
@@ -224,7 +224,7 @@ template <typename VT>
 struct MccSerializer<VT> : MccSerializerBase {
     constexpr static std::string_view serializerName{"MCC-ANGLE-SERIALIZER"};
 
-    template <typename ParamsT = mcc_serialization_params_t>
+    template <mcc_serialization_params_c ParamsT = mcc_serialization_params_t>
     error_t operator()(traits::mcc_output_char_range auto& output,
                        VT const& value,
                        ParamsT const& params = mcc_serialization_params_t{})
@@ -270,7 +270,7 @@ template <mcc_coord_epoch_c VT>
 struct MccSerializer<VT> : MccSerializerBase {
     constexpr static std::string_view serializerName{"MCC-COORD-EPOCH-SERIALIZER"};
 
-    template <typename ParamsT = mcc_serialization_params_t>
+    template <mcc_serialization_params_c ParamsT = mcc_serialization_params_t>
     error_t operator()(traits::mcc_output_char_range auto& output,
                        VT const& value,
                        ParamsT const& params = mcc_serialization_params_t{})
@@ -312,7 +312,7 @@ template <mcc_coord_pair_c VT>
 struct MccSerializer<VT> : MccSerializerBase {
     constexpr static std::string_view serializerName{"MCC-COORD-PAIR-SERIALIZER"};
 
-    template <typename ParamsT = mcc_serialization_params_t>
+    template <mcc_serialization_params_c ParamsT = mcc_serialization_params_t>
     error_t operator()(traits::mcc_output_char_range auto& output,
                        VT const& value,
                        ParamsT const& params = mcc_serialization_params_t{})
@@ -367,7 +367,7 @@ template <mcc_skypoint_c VT>
 struct MccSerializer<VT> : MccSerializerBase {
     constexpr static std::string_view serializerName{"MCC-SKYPOINT-SERIALIZER"};
 
-    template <typename ParamsT = mcc_serialization_params_t>
+    template <mcc_serialization_params_c ParamsT = mcc_serialization_params_t>
     error_t operator()(traits::mcc_output_char_range auto& output,
                        VT const& value,
                        ParamsT const& params = mcc_serialization_params_t{})
@@ -434,7 +434,7 @@ template <mcc_telemetry_data_c VT>
 struct MccSerializer<VT> : MccSerializerBase {
     constexpr static std::string_view serializerName{"MCC-TELEMETRY-DATA-SERIALIZER"};
 
-    template <typename ParamsT = mcc_serialization_params_t>
+    template <mcc_serialization_params_c ParamsT = mcc_serialization_params_t>
     error_t operator()(traits::mcc_output_char_range auto& output,
                        VT const& value,
                        ParamsT const& params = mcc_serialization_params_t{})
@@ -687,4 +687,7 @@ struct MccSerializer<VT> : MccSerializerBase {
     }
 };
 
+
+static_assert(mcc_serializer_c<MccSerializer<MccAngle>>, "!!!");
+
 }  // namespace mcc::impl
diff --git a/mcc_serialization_common.h b/mcc_serialization_common.h
index 334a254..29da0f5 100644
--- a/mcc_serialization_common.h
+++ b/mcc_serialization_common.h
@@ -352,14 +352,14 @@ protected:
 
 
 
-struct MccDeserializerBase : mcc_deserializer_interface_t<MccError> {
-    virtual ~MccDeserializerBase() = default;
+// struct MccDeserializerBase : mcc_deserializer_interface_t<MccError> {
+//     virtual ~MccDeserializerBase() = default;
 
-    using typename mcc_deserializer_interface_t<MccError>::error_t;
+//     using typename mcc_deserializer_interface_t<MccError>::error_t;
 
-protected:
-    MccDeserializerBase() = default;
-};
+// protected:
+//     MccDeserializerBase() = default;
+// };
 
 // template <mcc_serialization_params_c ParamsT>
 // struct MccSerializerBase : mcc_serializer_interface_t<MccError>, details::_params_manipulator_t<ParamsT> {