On 5/4/23 00:04, Leif H Silli wrote:
SVG and HTML are very similar w.r.g. how the language property of an
element is defined and works:
1) each have two language property attributes, a “native“
'lang' attribute plus the generic '6' attribute.
2) each permits <foo xml:lang="en" lang="en"/>
3) each forbids <foo xml:lang="fr" lang="en"/>
(the atributes must have the same content)
4) when consumed as XML, each spec allows
<foo xml:lang="fr" /> and
<foo lang="en" /> as well as
<foo xml:lang="en" lang="en"/>
5) Both gives priority to xml:lang, when consumed as XML.
6) Unlike SVG, HTML may also be consumed as text (text/html),
and then only the last two options are permitted:
<foo lang="en" /> as well as
<foo xml:lang="en" lang="en"/>
SVG2: https://www.w3.org/TR/SVG2/struct.html#LangSpaceAttrs
HTML5:
https://html.spec.whatwg.org/multipage/dom.html#the-lang-and-xml:lang-attributes
As showwn by validator.nu and validator.w3.org, the above can be
validated: Both of them offers what I would call 'level 1' validation,
by what I mean that they check whether the above rules are followed. And
in addition, when 'level 1' is passed, they offer 'level 2' validation,
by which I mean that they checks whether the content of the attributes
matches the usage rules for the registered language tags.
XMLmind currently offers no validation of lang and xml:lang - neither
level 1 nor level 2. I hereby suggest that 'level 1' validation is
added. (Level 2 validation would of course also be welcome, but is far
less fundamental).
What should be the consequences? I my view, it should be that,
a) when someone works with a HTML document (as opposed to a XHTML
document), adding xml:lang without also adding lang, should trigger a
warning, or error. (Warning can be justified since it could be that a
HTML document will be consumed as XML - after all, XMLmind is an XML
editork.)
b) if someone specifies both xml:lang and lang but with different
values, an error should be displayed.
Makes sense. We will try to implement this validation in the next
version of XXE (probably as a Schematron).
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