diff --git a/app/models/metadata_template.rb b/app/models/metadata_template.rb
index 45e6a4d0..e40bd891 100644
--- a/app/models/metadata_template.rb
+++ b/app/models/metadata_template.rb
@@ -1,5 +1,11 @@
 # frozen_string_literal: true
 
+module MetadataTemplateConstants
+  ALLOWED_ATTRIBUTES = %w[style href src alt controls data-align data-multimedia data-multimedia-inner id name].freeze
+  ALLOWED_TAGS = %w[strong em del u mark p h1 h2 h3 h4 h5 h6 ul ol li img iframe audio video div figure blockquote
+                    figcaption a sub sup small].freeze
+end
+
 # Representa la plantilla de un campo en los metadatos del artículo
 #
 # TODO: Validar el tipo de valor pasado a value= según el :type
@@ -8,6 +14,7 @@
 MetadataTemplate = Struct.new(:site, :document, :name, :label, :type,
                               :value, :help, :required, :errors, :post,
                               :layout, keyword_init: true) do
+  include MetadataTemplateConstants
   include Metadata::FrontMatterConcern
 
   # @return [String]
@@ -222,8 +229,8 @@ MetadataTemplate = Struct.new(:site, :document, :name, :label, :type,
 
     sanitizer
       .sanitize(string.tr("\r", '').unicode_normalize,
-                tags: allowed_tags,
-                attributes: allowed_attributes)
+                tags: ALLOWED_TAGS,
+                attributes: ALLOWED_ATTRIBUTES)
       .strip
       .html_safe
   end
@@ -233,16 +240,6 @@ MetadataTemplate = Struct.new(:site, :document, :name, :label, :type,
     @sanitizer ||= Rails::Html::Sanitizer.safe_list_sanitizer.new
   end
 
-  def allowed_attributes
-    @allowed_attributes ||= %w[style href src alt controls data-align data-multimedia data-multimedia-inner id
-                               name].freeze
-  end
-
-  def allowed_tags
-    @allowed_tags ||= %w[strong em del u mark p h1 h2 h3 h4 h5 h6 ul ol li img iframe audio video div figure blockquote
-                         figcaption a sub sup small].freeze
-  end
-
   # Decifra el valor
   #
   # @todo Agregar el error de decifrado en self.errors