[ruby-list:41854] rexml で doc.xml_decl.encoding = "shift-jis" は駄目ですか？

たけ(tk)です

rexml を試しているのですが、
rexml.xml_decl.encoding = "shift-jis" でエラーが出ます。

＊　エンコード、デコードしている部分としていない部分とがあるみたいです。

＊　C:/Progra~1/Apollo/lib/ruby/1.8/rexml/encodings/SHIFT-JIS.rb でNKFを
使うようにすると、別の部分でエラーになる。

----
#! ruby -Ks
require "rexml/document"

doc = REXML::Document.new
doc.xml_decl.encoding = "shift-jis"
p doc.encoding                  #=> "SHIFT-JIS"

##doc.add REXML::Element.new("pxd")
doc.add_element("pxd")

doc[1].attributes["name"] = "ichiranhyou"
p doc[1].attributes["name"]     #=> "ichiranhyou"
puts doc
  #=> <?xml version='1.0' encoding='SHIFT-JIS'?><pxd name='ichiranhyou'/>

doc[1].attributes["name"] = "一覧表"
p doc[1].attributes["name"]     #=> "一覧表"
puts doc[1].attributes["name"]  #=> 一覧表
puts doc
  #=> illegal UTF-8 sequence (88) (Uconv::Error)
  #=>   C:/Program Files/Apollo/lib/ruby/1.8/rexml/encodings/SHIFT-JIS.rb:13:in `u8tosjis'
  #=>   C:/Program Files/Apollo/lib/ruby/1.8/rexml/encodings/SHIFT-JIS.rb:13:in `encode'
  #=>   C:/Program Files/Apollo/lib/ruby/1.8/rexml/output.rb:17:in `<<'
  #=>   C:/Program Files/Apollo/lib/ruby/1.8/rexml/attribute.rb:143:in `write'
  #=>   C:/Program Files/Apollo/lib/ruby/1.8/rexml/element.rb:685:in `write'
  #=>   C:/Program Files/Apollo/lib/ruby/1.8/rexml/element.rb:1026:in `each_attribute'
  #=>   C:/Program Files/Apollo/lib/ruby/1.8/rexml/element.rb:1024:in `each_attribute'
  #=>   C:/Program Files/Apollo/lib/ruby/1.8/rexml/element.rb:683:in `write'
  #=>   C:/Program Files/Apollo/lib/ruby/1.8/rexml/document.rb:165:in `write'
  #=>   C:/Program Files/Apollo/lib/ruby/1.8/rexml/document.rb:163:in `write'
  #=>   C:/Program Files/Apollo/lib/ruby/1.8/rexml/node.rb:23:in `to_s'

p :ok
----

Windowsのコマンドラインでの実行

----
G:\apollo\tkUtils\PXDoc>ruby -v 1.rb
ruby 1.8.4 (2005-12-24) [i386-mswin32]
"SHIFT-JIS"
"ichiranhyou"
<?xml version='1.0' encoding='SHIFT-JIS'?><pxd name='ichiranhyou'/>
"一覧表"
一覧表
C:/Program Files/Apollo/lib/ruby/1.8/rexml/encodings/SHIFT-JIS.rb:13:in `u8tosjis': illegal UTF-8 sequence (88) (Uconv::Error)
        from C:/Program Files/Apollo/lib/ruby/1.8/rexml/encodings/SHIFT-JIS.rb:13:in `encode'
        from C:/Program Files/Apollo/lib/ruby/1.8/rexml/output.rb:17:in `<<'
        from C:/Program Files/Apollo/lib/ruby/1.8/rexml/attribute.rb:143:in `write'
        from C:/Program Files/Apollo/lib/ruby/1.8/rexml/element.rb:685:in `write'
        from C:/Program Files/Apollo/lib/ruby/1.8/rexml/element.rb:1026:in `each_attribute'
        from C:/Program Files/Apollo/lib/ruby/1.8/rexml/element.rb:1024:in `each_attribute'
        from C:/Program Files/Apollo/lib/ruby/1.8/rexml/element.rb:683:in `write'
        from C:/Program Files/Apollo/lib/ruby/1.8/rexml/document.rb:165:in `write'
        from C:/Program Files/Apollo/lib/ruby/1.8/rexml/document.rb:163:in `write'
        from C:/Program Files/Apollo/lib/ruby/1.8/rexml/node.rb:23:in `to_s'
        from 1.rb:19

G:\apollo\tkUtils\PXDoc>
----

linux での実行結果

----
[tk@EDiCube-02 PXDoc]$ ruby -v 1.rb | nkf
/usr/local/lib/ruby/1.8/rexml/encodings/SHIFT-JIS.rb:11:in `u8tosjis': illegal
UTF-8 sequence (88) (Uconv::Error)
        from /usr/local/lib/ruby/1.8/rexml/encodings/SHIFT-JIS.rb:11:in `encode'
        from /usr/local/lib/ruby/1.8/rexml/output.rb:17:in `<<'
        from /usr/local/lib/ruby/1.8/rexml/attribute.rb:143:in `write'
        from /usr/local/lib/ruby/1.8/rexml/element.rb:685:in `write'
        from /usr/local/lib/ruby/1.8/rexml/element.rb:1026:in `each_attribute'
        from /usr/local/lib/ruby/1.8/rexml/element.rb:1024:in `each_attribute'
        from /usr/local/lib/ruby/1.8/rexml/element.rb:683:in `write'
        from /usr/local/lib/ruby/1.8/rexml/document.rb:165:in `write'
        from /usr/local/lib/ruby/1.8/rexml/document.rb:163:in `write'
        from /usr/local/lib/ruby/1.8/rexml/node.rb:23:in `to_s'
        from 1.rb:23
ruby 1.8.4 (2005-12-24) [i686-linux]
"SHIFT-JIS"
"ichiranhyou"
<?xml version='1.0' encoding='SHIFT-JIS'?><pxd name='ichiranhyou'/>
"一覧表"
一覧表
[tk@EDiCube-02 PXDoc]$
----

C:/Progra~1/Apollo/lib/ruby/1.8/rexml/encodings/SHIFT-JIS.rb で「 begin
//require 'uconv'・・」をコメントアウトして、NKFを使うようにすると、別の
部分でエラーになる。名前が入っていない。

----
G:\apollo\tkUtils\PXDoc>ruby -v 1.rb
ruby 1.8.4 (2005-12-24) [i386-mswin32]
"SHIFT-JIS"
"ichiranhyou"
<?xml version='1.0' encoding='SHIFT-JIS'?><pxd name='ichiranhyou'/>
"一覧表"
一覧表
<?xml version='1.0' encoding='SHIFT-JIS'?><pxd name=''/> # ←★
:ok

G:\apollo\tkUtils\PXDoc>
----

Take_tk = KUMAGAI Hidetake
たけ(tk)＝熊谷秀武