diff --git a/src/bt_ifcmanager/lib/lib_ifc/IfcSite_su.rb b/src/bt_ifcmanager/lib/lib_ifc/IfcSite_su.rb
index 8e672bd..5e4bc3b 100644
--- a/src/bt_ifcmanager/lib/lib_ifc/IfcSite_su.rb
+++ b/src/bt_ifcmanager/lib/lib_ifc/IfcSite_su.rb
@@ -23,60 +23,85 @@
 
 module BimTools
   module IfcSite_su
+    @reflatitude = nil
+    @reflongitude = nil
+
     # add project location, if set in sketchup model
     # (!) north angle still missing?
     def set_latlong
-      if Sketchup.active_model.georeferenced?
-        local_point = Geom::Point3d.new([0, 0, 0])
-        @latlong = Sketchup.active_model.point_to_latlong(local_point)
+      return unless Sketchup.active_model.georeferenced?
+
+      local_point = Geom::Point3d.new([0, 0, 0])
+      @latlong = Sketchup.active_model.point_to_latlong(local_point)
+    end
+
+    def reflatitude=(values)
+      if valid_latlong_list?(values)
+        @reflatitude = values
+      else
+        puts 'Invalid reflatitude values'
       end
     end
 
-    def latitude
-      return lat_long_ifc(@latlong[1]) if @latlong
+    def reflongitude=(values)
+      if valid_latlong_list?(values)
+        @reflongitude = values
+      else
+        puts 'Invalid reflongitude values'
+      end
     end
 
-    def longtitude
-      return lat_long_ifc(@latlong[0]) if @latlong
+    def reflatitude
+      lat_long_ifc(@latlong[1]) if @latlong
+    end
+
+    def reflongitude
+      lat_long_ifc(@latlong[0]) if @latlong
     end
 
     def elevation
-      return IfcManager::Types::IfcLengthMeasure.new(@ifc_model, @latlong[2]) if @latlong
+      IfcManager::Types::IfcLengthMeasure.new(@ifc_model, @latlong[2]) if @latlong
+    end
+
+    private
+
+    def valid_latlong_list?(values)
+      values.is_a?(Array) && values.all? { |v| v.is_a?(IfcCompoundPlaneAngleMeasure) }
     end
 
     # convert sketchup latlong coordinate (decimal) to IFC notation (degrees)
     def lat_long_ifc(coordinate)
-      if Sketchup.active_model.georeferenced?
-        d = coordinate.abs
-        neg_pos = (coordinate / d).to_int
-
-        # degrees
-        i = d.to_int
-        deg = i * neg_pos
-
-        # minutes
-        d -= i
-        d *= 60
-        i = d.to_int
-
-        min = i * neg_pos
-
-        # seconds
-        d -= i
-        d *= 60
-        i = d.to_int
-        sec = i * neg_pos
-
-        # millionth-seconds
-        d -= i
-        d *= 1_000_000
-        i = d.to_int
-        msec = i * neg_pos
-
-        # (!) values should be Ifc INTEGER objects instead of Strings(!)
-        # (!) returned object should be of type IFC LIST instead of IFC SET
-        IfcManager::Types::List.new([deg.to_s, min.to_s, sec.to_s, msec.to_s])
-      end
+      return unless Sketchup.active_model.georeferenced?
+
+      d = coordinate.abs
+      neg_pos = (coordinate / d).to_int
+
+      # degrees
+      i = d.to_int
+      deg = i * neg_pos
+
+      # minutes
+      d -= i
+      d *= 60
+      i = d.to_int
+
+      min = i * neg_pos
+
+      # seconds
+      d -= i
+      d *= 60
+      i = d.to_int
+      sec = i * neg_pos
+
+      # millionth-seconds
+      d -= i
+      d *= 1_000_000
+      i = d.to_int
+      msec = i * neg_pos
+
+      # (!) values should be Ifc INTEGER objects instead of Strings(!)
+      # (!) returned object should be of type IFC LIST instead of IFC SET
+      IfcManager::Types::List.new([deg.to_s, min.to_s, sec.to_s, msec.to_s])
     end
   end
 end
diff --git a/src/bt_ifcmanager/lib/lib_ifc/ifc_types.rb b/src/bt_ifcmanager/lib/lib_ifc/ifc_types.rb
index d219726..97031f4 100644
--- a/src/bt_ifcmanager/lib/lib_ifc/ifc_types.rb
+++ b/src/bt_ifcmanager/lib/lib_ifc/ifc_types.rb
@@ -26,7 +26,6 @@
 module BimTools
   module IfcManager
     module Types
-
       # https://technical.buildingsmart.org/wp-content/uploads/2018/05/IFC2x-Model-Implementation-Guide-V2-0b.pdf
       # page 19 and 20
       def self.replace_char(in_string)
@@ -207,6 +206,49 @@ def true?(obj)
       # OR
       # ((SELF[1] <= 0) AND (SELF[2] <= 0) AND (SELF[3] <= 0) AND ((SIZEOF(SELF) = 3) OR (SELF[4] <= 0)));
       # END_TYPE;
+      class IfcCompoundPlaneAngleMeasure < BaseType
+        def initialize(ifc_model, values, long = false)
+          super(ifc_model, values, long)
+          @values = values.map(&:to_i)
+          validate!
+        end
+
+        def step
+          val = @values.join(',')
+          val = add_long(val) if @long
+          val
+        end
+
+        private
+
+        def validate!
+          raise ArgumentError, 'List must have 3 or 4 integers' unless (3..4).include?(@values.size)
+          raise ArgumentError, 'Minutes must be in range' unless minutes_in_range?
+          raise ArgumentError, 'Seconds must be in range' unless seconds_in_range?
+          raise ArgumentError, 'Microseconds must be in range' unless microseconds_in_range?
+          raise ArgumentError, 'Sign must be consistent' unless consistent_sign?
+        end
+
+        def minutes_in_range?
+          @values[1].abs < 60
+        end
+
+        def seconds_in_range?
+          @values[2].abs < 60
+        end
+
+        def microseconds_in_range?
+          @values.size == 3 || @values[3].abs < 1_000_000
+        end
+
+        def consistent_sign?
+          if @values[0] >= 0
+            @values.all? { |v| v >= 0 }
+          else
+            @values.all? { |v| v <= 0 }
+          end
+        end
+      end
 
       # TYPE IfcContextDependentMeasure = REAL;
       # END_TYPE;
@@ -923,7 +965,7 @@ class IfcVolumetricFlowRateMeasure < IfcReal
       # END_TYPE;
 
       class PEnum_ElementStatus
-        def initialize(ifc_model, value, long = true)
+        def initialize(_ifc_model, value, _long = true)
           @value = value
         end
 
@@ -931,7 +973,6 @@ def step
           @value
         end
       end
-
     end
   end
 end
diff --git a/src/bt_ifcmanager/lib/lib_ifc/parse_xsd.rb b/src/bt_ifcmanager/lib/lib_ifc/parse_xsd.rb
index d344262..f617007 100644
--- a/src/bt_ifcmanager/lib/lib_ifc/parse_xsd.rb
+++ b/src/bt_ifcmanager/lib/lib_ifc/parse_xsd.rb
@@ -60,6 +60,7 @@ class IfcXsdParser
         IfcRelDefinesByProperties
         IfcRelDefinesByType
         IfcRelContainedInSpatialStructure
+        IfcSite
         IfcSpatialStructureElement
         IfcStyledItem
         IfcTypeProduct
@@ -241,6 +242,7 @@ def get_mixin(ifc_name)
         mixin_file = Pathname.new("#{PLUGIN_ROOT_PATH}/bt_ifcmanager/lib/lib_ifc/#{ifc_name}_su.rb")
         if mixin_file.exist?
           require_relative(mixin_file)
+          puts "loaded #{ifc_name}_su"
           return BimTools.const_get(ifc_name + '_su')
         end
         nil
@@ -285,7 +287,6 @@ def create_ifc_class(ifc_name, ifc_object, ifc_objects)
 
           ifc_attributes = get_ifc_attributes(ifc_object, ifc_name)
 
-
           if mixin && mixin.respond_to?(:required_attributes)
             ifc_attributes.concat(mixin.required_attributes)
             ifc_attributes.uniq!