Do not add xsi:nil

CHANGELOG.md

@@ -1,5 +1,11 @@
 # Changelog
 
+## [0.5.2] - 2026-01-07
+
+### Fixed
+
+- Preserve @version and @encoding attributes outside the ?xml node
+
 ## [0.5.1] - 2024-04-25
 
 ### Fixed

lib/oxml/builder.rb

@@ -34,7 +34,8 @@ def traverse_hash(hash, builder)
         elsif value.is_a?(Array)
           traverse_array(key, value, builder)
         elsif value.nil?
-          builder.element(Utils.camelize(key), 'xsi:nil': 'true')
+          builder.element(Utils.camelize(key))
+          builder.pop
         else
           builder.element(Utils.camelize(key))
           builder.text(value)

lib/oxml/parser.rb

@@ -31,8 +31,10 @@ def attr(name, str)
       @last_attr = "#{name}:#{str}"
       return if @delete_namespace_attributes
 
-      return if name == :version
-      return if name == :encoding
+      # @version and @encoding are attributes of the leading ?xml node we ignore. Checking for the
+      # empty array detects the ?xml origin. Without the check they would become leading nodes
+      return if name == :version && @arr.empty?
+      return if name == :encoding && @arr.empty?
 
       start_element("@#{name}")
       text(str)

lib/oxml/version.rb

@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module OXML
-  VERSION = '0.5.1'
+  VERSION = '0.5.2'
 end