(2017-04-08)

・Slightly modified the wording in the paragraph immediately
　following Corollary B

・Added some supplementary explanatory paragraphs following
　Corollary C

・Added Remark 3.12.2, as well as a reference to this remark
　immediately preceding Theorem D

・Added a reference to [CmbCusp], Remark 4.2.1, at the end of
　Definition 2.7

・Modified slightly misleading wording in the statement of
　Corollary 2.10, (iv)

・Added [AbsTopIII], [Pano] to the list of references

(2021-11-08)

・Slightly modified the Abstract

・On the first page, deleted the information concerning grants

・Slightly modified condition (b) in the statement of Theorem D

・Added Acknowledgements

・Slightly modified the discussion entitled "Log Schemes" in \S 0

・Corrected two misprints ("finitely-generated" ---> "finitely generated") in the statement of Proposition 2.2

・Slightly modified the statements of Corollary 2.8, (i), (ii)

・Slightly modified Definition 3.1, (iii)

・Added Remarks 3.1.1, 3.1.2

・Slightly modified the proofs of Proposition 3.3, (ii), (v), (vi), (viii)

・In the proof of Lemma 3.6, replaced "Proposition 1.3, (ii)" by "Proposition 3.5"

・Slightly modified conditions (b) and (i) in the statement of Theorem 3.8

・In the proof of Theorem 3.8, replaced "[MT], Remark 1.2.2" by "Proposition 1.4"

・Slightly modified Definition 3.10

・Slightly modified Remark 3.11.1

・Added entries for [Bbk], [CanLift] in the list of References

・Deleted the entry for [EGA] in the list of References

・Updated the entries for [Higashi], [CbTpII] in the list of References

・Corrected a misprint ("Hiroshima. Math. J." ---> "Hiroshima Math. J.") in the entry [Hsh] in the list of References

・Corrected a misprint ("Hirosima Math J" ---> "Hiroshima Math. J.") in the entry [NodNon] in the list of References