SCM properties = gh_list (me->mutable_property_alist_, me->immutable_property_alist_,SCM_UNDEFINED);
Molecule num = Text_item::text2molecule (me, text, properties);
SCM properties = gh_list (me->mutable_property_alist_, me->immutable_property_alist_,SCM_UNDEFINED);
Molecule num = Text_item::text2molecule (me, text, properties);