Article. IV.
Section. 1.
Full Faith and Credit shall be given in each State to the public Acts, Records, and judicial Proceedings of every other State. And the Congress may by general Laws prescribe the Manner in which such Acts, Records and Proceedings shall be proved, and the Effect thereof.
Article IV, Section 1 has to do with relationships between the states. It speaks to laws enacted in one state being given full faith and credit in all the states. It has no bearing on the Schiavo case whatsoever.