Typo in XHTML 1.1 style sheets module?

问题

The XHTML 1.1 modular DTD at https://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd defines the style module like this:

<!-- Style Sheets Module  ......................................... -->
<!ENTITY % xhtml-style.module "INCLUDE" >
<![%xhtml-style.module;[
<!ENTITY % xhtml-style.mod
     PUBLIC "-//W3C//ELEMENTS XHTML Style Sheets 1.0//EN"
            "http://www.w3.org/MarkUp/DTD/xhtml-style-1.mod" >
%xhtml-style.mod;]]>

But the actual file at http://www.w3.org/MarkUp/DTD/xhtml-style-1.mod defines the public identifier differently in its comments:

     This DTD module is identified by the PUBLIC and SYSTEM identifiers:

       PUBLIC "-//W3C//DTD XHTML Style Sheets 1.0//EN"
       SYSTEM "http://www.w3.org/MarkUp/DTD/xhtml-style-1.mod"

As -//W3C//DTD XHTML Style Sheets 1.0//EN isn't consistent with all the other module public identifiers, I wonder if it's a typo.

Interestingly an old version I have of the XHTML 1.1 DTD includes the header from xhtml-style-1.mod in a comment, actually indicates the consistent public identifier when referencing the file:

<!-- Style Sheets Module  ......................................... -->
<!ENTITY % xhtml-style.module "INCLUDE" >
<![%xhtml-style.module;[
<!ENTITY % xhtml-style.mod
     PUBLIC "-//W3C//ELEMENTS XHTML Style Sheets 1.0//EN"
            "http://www.w3.org/TR/xhtml-modularization/DTD/xhtml-style-1.mod" >
<!-- ...................................................................... -->
<!-- XHTML Document Style Sheet Module  .................................... -->
<!-- file: xhtml-style-1.mod

     This is XHTML, a reformulation of HTML as a modular XML application.
     Copyright 1998-2001 W3C (MIT, INRIA, Keio), All Rights Reserved.
     Revision: $Id: xhtml-style-1.mod,v 4.0 2001/04/02 22:42:49 altheim Exp $ SMI

     This DTD module is identified by the PUBLIC and SYSTEM identifiers:

       PUBLIC "-//W3C//DTD XHTML Style Sheets 1.0//EN"
       SYSTEM "http://www.w3.org/TR/xhtml-modularization/DTD/xhtml-style-1.mod"

     Revisions:
     (none)
     ....................................................................... -->

<!-- Style Sheets

        style

     This module declares the style element type and its attributes,
     used to embed stylesheet information in the document head element.
-->

The most recent version of the XHTML 1.1 DTD at https://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd doesn't even include the module header comments.

<!-- Style Sheets Module  ......................................... -->
<!ENTITY % xhtml-style.module "INCLUDE" >
<![%xhtml-style.module;[
<!ENTITY % xhtml-style.mod
     PUBLIC "-//W3C//ELEMENTS XHTML Style Sheets 1.0//EN"
            "http://www.w3.org/MarkUp/DTD/xhtml-style-1.mod" >
%xhtml-style.mod;]]>

So is -//W3C//DTD XHTML Style Sheets 1.0//EN a typo, and can this public identifier safely be ignored?

来源：https://stackoverflow.com/questions/60568097/typo-in-xhtml-1-1-style-sheets-module

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