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Absolute Topics I
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・Corrected typos on pp. 23, 25, 28, 34, 46, 48, 49, 61, 62, 81. 

・Made slight modifications to \S 0, ``Algebraic Stacks and Log Schemes''.

・Made slight modifications to the statement of Theorem 1.7, (ii).

・Made slight modifications to (4) on p. 16.

・Made slight modifications to the statement of Theorem 2.11, (ii).

・Made slight modifications to the statement of Lemma 4.5, (iii).

・Made slight modifications to the Remark 4.11.1.

・Made a slight modification to the beginning of the proof of Proposition A.8, (iii).