<corr> and <sic> for correction
(or non-correction)
<reg> and <orig> for regularization
(or the reverse)
... for his nose was as sharp as a pen and
<reg sic="a'">he</reg>
<corr orig='table' ed=Gifford>
babbl'd</corr>
of green  <reg sic='feelds'>fields</reg>
24