def target_partname(self):
"""
|PackURI| instance containing partname targeted by this relationship.
Raises ``ValueError`` on reference if target_mode is ``'External'``.
Use :attr:`target_mode` to check before referencing.
"""
if self.is_external:
msg = ('target_partname attribute on Relationship is undefined w'
'here TargetMode == "External"')
raise ValueError(msg)
# lazy-load _target_partname attribute
if not hasattr(self, '_target_partname'):
self._target_partname = PackURI.from_rel_ref(
self._baseURI, self.target_ref)
return self._target_partname
def it_can_construct_from_relative_ref(self):
baseURI = '/ppt/slides'
relative_ref = '../slideLayouts/slideLayout1.xml'
pack_uri = PackURI.from_rel_ref(baseURI, relative_ref)
assert pack_uri == '/ppt/slideLayouts/slideLayout1.xml'