Re: RFE: Add level 1 validation of @lang and @xml:lang

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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