def upgrade_authors(root, data):
for which in 'creator', 'contributor':
for elem in XPath('./opf:metadata/dc:' + which)(root):
role = elem.attrib.pop(OPF('role'), None)
sort = elem.attrib.pop(OPF('file-as'), None)
if role or sort:
aid = ensure_id(elem)
metadata = elem.getparent()
if role:
m = metadata.makeelement(OPF('meta'),
attrib={
'refines': '#' + aid,
'property': 'role',
'scheme': 'marc:relators'
})
m.text = role
metadata.append(m)
if sort:
m = metadata.makeelement(OPF('meta'),
attrib={
'refines': '#' + aid,
'property': 'file-as'
})
m.text = sort
metadata.append(m)
def upgrade_identifiers(root, data):
for ident in XPath('./opf:metadata/dc:identifier')(root):
val = (ident.text or '').strip()
lval = val.lower()
scheme = ident.attrib.pop(OPF('scheme'), None)
if lval.startswith('urn:'):
prefix, rest = val[4:].partition(':')[::2]
if prefix and rest:
scheme, val = prefix, rest
if scheme and val:
ident.text = '{}:{}'.format(scheme, val)
for attr in tuple(ident.attrib):
if attr != 'id':
del ident.attrib[attr]
