Rule 8.8.1

Summary

This test consists in checking whether each change of language is valid

Business description

Criterion

8.8

Test

8.8.1

Description

Dans chaque page Web, chaque changement de langue (attribut lang et/ou xml:lang) est-il valide ?

Level

AA

Technical description

Scope

page

Decision level

semidecidable

Algorithm

Set1

All the tags different from <html> that have a "lang" or a "xml:lang" attribute

Process

Test1

We extract the language code from the "lang" or the "xml:lang" attributes from elements of Set2. If these attributes are both set and different, we keep the "xml:lang" attribute if the doctype of the page is found within the "XhtmlDoctypeDeclarations" whitelist, and we keep the "lang" attribute instead.

For each extracted lang attribute, we check its validity regarding the following regexp : "\w{2,3}(\-\w{2,})?$"

For each invalid element, raise a messageA.

MessageA : Malformed Language Declaration

code : MalformedLanguageDeclaration
status: Failed
parameter : extracted lang
present in source : yes

Test2

We extract the language code from the "lang" or the "xml:lang" attributes from elements of Set2. If these attributes are both set and different, we keep the "xml:lang" attribute if the doctype of the page is found within the "XhtmlDoctypeDeclarations" whitelist, and we keep the "lang" attribute instead.

For each extracted lang attribute, we check its validity regarding the "ValidLanguageCode" whitelist

Used nomenclature : "ValidLanguageCode", "XhtmlDoctypeDeclarations"
Reference : All the valid language codes recommanded in http://www.loc.gov/standards/iso639-2/php/code_list.php and all the xhtml doctypes declarations recommanded in http://www.w3.org/QA/2002/04/valid-dtd-list.html

For each invalid element, raise a messageA.

MessageB : Wrong Language Declaration

code : WrongLanguageDeclaration
status: Failed
parameter : extracted lang
present in source : yes

Analysis

Not Applicable

The page has no tag different from <html> with the "lang" or "xml:lang" attribute (Set1 is empty)

Passed

All the lang declarations are valid and well-formed (Test1 AND Test2 return true for all elements of Set1)

Failed

At least one lang declaration is valid or badly-formed (Test1 OR Test2 return false for at least one element of Set1)