implement extracting from:
xidel /home/kszumny/gandalf.formated.xml --xpath '/offers/group/o/[ @id, name/text(), @url, @price]'
orxidel --color=never /home/kszumny/woblink.xml --xpath3 '/offers/group/o/{"id": @id, "name": name/text(), "author": ./author/text()}'
- use generators