It is occasionally necessary to indicate a group of lines for which the line-breaks are significant; this might be the case for verse, for example. This element contains a sequence of line elements, each of which contains a single line of text. There is no guarantee that individual lines will not be broken, only that the significant line-breaks will be indicated.
Compare this with the verbatim element. That also honours line-breaks, but it additionally sets the text in a typewriter font.
(line +
)
linespecific |_(line+)