Asqatasun v4 - AccessiWeb 2.2 - Rule 8.4.1
Summary
We check whether the language specified for each textual element of the page is correct (regarding the code list given in the following page http://www.loc.gov/standards/iso639-2/php/code_list.php) and relevant.
Business description
Criterion : 8.4
Test : 8.4.1
Test description :
Test8.4.1: For each Web page with a default human language, does the language code pass the conditions below?
- The language code is valid
- The language code is relevant
Level : Bronze
Technical description
Scope : page
Decision level : semidecidable
Algorithm
Selection
Selection
Set 1 :
The <html>
tag with a lang
or xml:lang
attribute.
Set 2 :
The textual tags (tags with a title
attribute, an alt
attribute or some content) without lang
or xml:lang
attribute. These attributes can be set to the current tag or to one of its ascendants.
Set 3 :
All the textual elements of the page which are not overidden by a lang
attribute.
Set 3 :
All the textual elements of the page which are overidden by a lang
attribute.
Process
Test 1:
We extract the language code from the lang
or the xml:lang
attributes from elements of Set 2. 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
MessageA : Wrong Language Declaration
- code : WrongLanguageDeclaration
- status: Failed
- parameter : none
- present in source : yes
Test 2:
We extract the language code from the lang
or the xml:lang
attributes from elements of Set 2. 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
MessageA : Wrong Language Declaration
- code : WrongLanguageDeclaration
- status: Failed
- parameter : none
- present in source : yes
Test 3:
We detect the language of the textual elements of the page which are not overidden by a lang
attribute (Set 3).
IF the detected language corresponds to the specified language AND the detection is seen as unreliable (regarding the google AJAX API detection described in the page http://code.google.com/intl/fr/apis/language/translate/v1/using_rest_langdetect.html#json_response
THEN raise Message A and return NMI
ELSE IF the detected language doesn't corresponds to the specified language AND the detection is seen as reliable
THEN raise Message B and return FAILED
ELSE IF the detected language doesn't corresponds to the specified language AND the detection is seen as unreliable
THEN raise Message C and return NMI
ELSE return PASSED
Test 4:
We detect the language of the textual elements of the page which are overidden by a lang attribute (Set 4).
IF the detected language corresponds to the specified language AND the detection is seen as unreliable (regarding the google AJAX API detection described in the page http://code.google.com/intl/fr/apis/language/translate/v1/using_rest_langdetect.html#json_response
THEN raise Message A and return NMI
ELSE IF the detected language doesn't corresponds to the specified language AND the detection is seen as reliable
THEN raise Message B and return FAILED
ELSE IF the detected language doesn't corresponds to the specified language AND the detection is seen as unreliable
THEN raise Message C and return NMI
ELSE return PASSED
MessageA : Suspected Relevant Language Declaration
-
code : SuspectedRelevantLanguageDeclaration
-
status: NMI
- parameter : the extracted language, the detected language, and an extraction of the text (limited to 200 charachters) from which the detection has been applied
- present in source : yes
MessageB : Unrelevant Language Declaration
-
code : UnrelevantLanguageDeclaration
-
status: Failed
- parameter : the extracted language, the detected language, and an extraction of the text (limited to 200 charachters) from which the detection has been applied
- present in source : yes
MessageC : Suspected Unrelevant Language Declaration
-
code : SuspectedUnrelevantLanguageDeclaration
-
status: NMI
- parameter : the extracted language, the detected language, and an extraction of the text (limited to 200 charachters) from which the detection has been applied
- present in source : yes
Analysis
Not Applicable
Selections are empty (The page has language declarations, that means that Set1 and Set2 are empty)
Failed
Test1 OR Test2 OR Test3 OR test4 returns FAILED
Passed
Test1 AND Test2 return true AND Test3 AND Test4 return PASSED
Pre-qualified
Test3 OR test4 returns NMI
Notes
No notes yet for that rule