#33117: sitemap.xml template used with alternates for multiple languages 
returns an
invalid xml
----------------------------------+--------------------------------------
     Reporter:  Viggie            |                    Owner:  nobody
         Type:  Bug               |                   Status:  new
    Component:  contrib.sitemaps  |                  Version:  3.2
     Severity:  Normal            |               Resolution:
     Keywords:                    |             Triage Stage:  Unreviewed
    Has patch:  0                 |      Needs documentation:  0
  Needs tests:  0                 |  Patch needs improvement:  0
Easy pickings:  1                 |                    UI/UX:  0
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Comment (by Florian Demmer):

 What validator was used to produce this error?

 Not only is the namespace name "http://www.w3.org/1999/xhtml"; valid, the
 name "http://www.w3.org/1999/xhtml/"; (with trailing slash) would be a
 different namespace.

 As specified in [https://www.w3.org/TR/REC-xml-names/#NSNameComparison 2.3
 Comparing URI References]:

   URI references identifying namespaces are compared when determining
 whether a name belongs to a given namespace, and whether two names belong
 to the same namespace. [Definition: The two URIs are treated as strings,
 and they are identical if and only if the strings are identical, that is,
 if they are the same sequence of characters. ] The comparison is case-
 sensitive, and no %-escaping is done or undone.

 and [https://www.w3.org/TR/REC-xml-names/#ns-decl 3 Declaring Namespaces]:

   The namespace name, to serve its intended purpose, SHOULD have the
 characteristics of uniqueness and persistence. It is not a goal that it be
 directly usable for retrieval of a schema (if any exists).

 The namespace name for XHTML is specified [https://www.w3.org/1999/xhtml/
 here]:

   The namespace name http://www.w3.org/1999/xhtml is intended for use in
 various specifications such as: [...]

 Therefore I conclude, that the validator and the StackOverflow
 recommendations are wrong and nothing should be changed in the
 {{{sitemap.xml}}} template.

-- 
Ticket URL: <https://code.djangoproject.com/ticket/33117#comment:2>
Django <https://code.djangoproject.com/>
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