fix: lookup of facsimile uri
Formerly, we implicitly expected that only tei:pb
within tei:text[@type = 'transcription']
will have a @facs
attribute. Page beginnings within other text types were not allowed to have @facs
.
We now explicitly filter only for tei:pb[ancestor::tei:text[@type = 'transcription']]
in order to retrieve the facsimile URI. This helps us being more robust when @facs
appears in other text types' tei:pb
s.