The value must conform to BCP 47. If the value is a private use code (i.e., starts with x- or contains -x-), a language element with a matching value for its ident attribute should be supplied in the TEI header to document this value. Such documentation may also optionally be supplied for non-private-use codes, though these must remain consistent with their (IETF)Internet Engineering Task Force definitions.
<p> … The consequences of this rapid depopulation were the loss of the last <foreign xml:lang="rap">ariki</foreign> or chief (Routledge 1920:205,210) and their connections to ancestral territorial organization.</p>
the xml:lang value will be inherited from the immediately enclosing element, or from its parent, and so on up the document hierarchy. It is generally good practice to specify xml:lang at the highest appropriate level, noticing that a different default may be needed for the teiHeader from that needed for the associated resource element or elements, and that a single TEI document may contain texts in many languages.
may contain any number of tokens, each of which may contain letters, punctuation marks, or symbols, but not whitespace or word-separating characters.
<head rend="align(center) case(allcaps)"> <lb/>To The <lb/>Duchesse <lb/>of <lb/>Newcastle, <lb/>On Her <lb/> <hi rend="case(mixed)">New Blazing-World</hi>. </head>
These Guidelines make no binding recommendations for the values of the rend attribute; the characteristics of visual presentation vary too much from text to text and the decision to record or ignore individual characteristics varies too much from project to project. Some potentially useful conventions are noted from time to time at appropriate points in the Guidelines. The values of the rend attribute are a set of sequence-indeterminate individual tokens separated by whitespace.
The rendition attribute is used in a very similar way to the class attribute defined for XHTML but with the important distinction that its function is to describe the appearance of the source text, not necessarily to determine how that text should be presented on screen or paper.
Where both rendition and rend are supplied, the latter is understood to override or complement the former.
Each URI provided should indicate a rendition element defining the intended rendition in terms of some appropriate style language, as indicated by the scheme attribute.