The content of this element should be the expanded abbreviation, usually (but not always) a complete word or phrase. The ex element provided by the transcr module may be used to mark up sequences of letters supplied within such an expansion.
If abbreviations are expanded silently, this practice should be documented in the editorialDecl, either with a normalization element or a p.
Esempio
The address is Southmoor <choice> <expan>Road</expan> <abbr>Rd</abbr> </choice>