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Re: UTF-8 BOM

• From: Rob Lugt <roblugt@e...>
• To: Richard Tobin <richard@c...>, xml-dev@l...
• Date: Thu, 14 Jun 2001 13:08:32 +0100

Richard,

Here is the output from the ElCel Technology XML Validator [1]

http://www.cogsci.ed.ac.uk/~richard/bomtest/doc.xml is well formed
http://www.cogsci.ed.ac.uk/~richard/bomtest/docx.xml is well formed
http://www.cogsci.ed.ac.uk/~richard/bomtest/ent.xml is well formed
http://www.cogsci.ed.ac.uk/~richard/bomtest/entx.xml is well formed
http://www.cogsci.ed.ac.uk/~richard/bomtest/ent2.xml is well formed
ent2x.ent [1:7] : Fatal error: 'xml' is not a valid processing instruction
target

The ElCel Technology parser examines every external entity for a BOM.  It
recognizes the 7 BOMs listed in XML 1.0 Appendix F.1, i.e. UCS-4 (x 4),
UTF-16BE, UTF-16LE and UTF-8.  When a BOM is recognized, it is removed from
the input stream before the stream is decoded and passed on to the parser.

Regards
Rob Lugt
ElCel Technology

[1] http://www.elcel.com/products/xmlvalid.html


----- Original Message -----
From: "Richard Tobin" <richard@c...>
To: <xml-dev@l...>
Sent: Thursday, June 14, 2001 12:23 PM
Subject: UTF-8 BOM


> The W3C XML Core WG is considering the question of whether a UTF-8
> byte-order make (BOM) is allowed at the start of an XML entity.  This
> question was raised a few weeks ago in a thread on comp.text.xml
> starting at article
>
>   <180520011620538217%andreas.prilop@a...>
>
> We would like to determine how existing parsers handle the byte
> sequence #xEF #xBB #xBF when it appears at the start of an XML
> document or other entity.  Is it treated as a BOM (and not part
> of the text of the entity) or as a zero-width non-breaking space
> character?
>
> We have placed a number of test cases at
>
>   http://www.cogsci.ed.ac.uk/~richard/bomtest/
>
> and would be grateful for feedback on how parsers handle them.  Please
> post results here in xml-dev to avoid unnecessary duplication.
>
> We would also like to know of any editors (or similar tools) that
> generate XML documents starting with a UTF-8 BOM.
>
> -- Richard (on behalf of the XML Core WG)
>
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• References:
  • UTF-8 BOM
    • From: Richard Tobin <richard@c...>

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