def _rewrite_values(self, source_property, target_property):
for value in source_property.values:
# create new value object (embedded document)
v = Value()
# copy value related fields
v.value = value.value
v.uncertainty = value.uncertainty
v.unit = value.unit
v.type_name = value.dtype
v.definition = value.definition
v.reference = value.reference
v.filename = value.filename
v.encoder = value.encoder
v.checksum = value.checksum
# add new object to target property values collection
target_property.values.append(v)
