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%lang-focus-atts; Multi-language Focus Attributes

Indicate how members of a language-group (which point to an @id using @lang-group) are related to each other. This information can act as a hint for how the language variants might be displayed.
Declaration
<!ENTITY % lang-focus-atts
            "lang-focus (%lang-focus-types;)              #IMPLIED
             lang-focus-custom 
                        CDATA                             #IMPLIED"  >
Expanded Declaration

lang-focus (primary | secondary | undefined | custom) #IMPLIED lang-focus-custom CDATA #IMPLIED