md_new_property
propp = md_new_property(mdp, nodep, MDET_PROP_VAL, sp);
propp = md_new_property(mdp, nodep, MDET_PROP_STR, sp);
propp = md_new_property(mdp, nodep, MDET_PROP_DAT, sp);
propp = md_new_property(mdp, nodep, MDET_PROP_ARC, arcnamep);