more cleanup

1 files changed, 7 insertions, 6 deletions

diff --git a/lib/axlsx/drawing/ax_data_source.rb b/lib/axlsx/drawing/ax_data_source.rb
index 5bbfd55b..ebbfe2cd 100644
--- a/lib/axlsx/drawing/ax_data_source.rb
+++ b/lib/axlsx/drawing/ax_data_source.rb
@@ -1,14 +1,9 @@
 module Axlsx
+
   # An axis data source that can contain referenced or literal strings or numbers
   # @note only string data types are supported - mainly because we have not implemented a chart type that requires a numerical axis value
   class AxDataSource < NumDataSource
 
-    # allowed element tag names
-    # @return [Array]
-    def self.allowed_tag_names
-      [:xVal, :cat]
-    end
-
     # creates a new NumDataSource object
     # @option options [Array] data An array of Cells or Numeric objects
     # @option options [Symbol] tag_name see tag_name
@@ -19,6 +14,12 @@ module Axlsx
       super(options)
     end
 
+    # allowed element tag names for serialization
+    # @return [Array]
+    def self.allowed_tag_names
+      [:xVal, :cat]
+    end
+
   end
 
 end