There are two ways to mark erroneous inclusion as
dictated by the guidelines:
Valeria<sic corr="">a</sic>nus
Valeria<corr sic="a"/>nus
Both should produce the same result:
Valeria{a}nus
But the standard xslts fail against the first example,
thus:
Valeria< >nus
Valeria{a}nus
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this should be a quick fix ...
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Problem was in erroneousinclusion.xml - there was a blank
space inside the 'empty' corr attribute. Note though that
somebody needs to open a feature request for the issue
raised in a note to that file by GB.