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-rw-r--r--lib/rexml/dtd/dtd.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/rexml/dtd/dtd.rb b/lib/rexml/dtd/dtd.rb
index 62317bac9e..927d5d847b 100644
--- a/lib/rexml/dtd/dtd.rb
+++ b/lib/rexml/dtd/dtd.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require "rexml/dtd/elementdecl"
require "rexml/dtd/entitydecl"
require "rexml/comment"