2313 2005-09-28 13:19:28 +0000 Tie precisionDecimal to IEEE754R more clearly 2006-01-15 00:31:47 +0000 1 1 1 Unclassified XML Schema Datatypes: XSD Part 2 1.1 only PC Windows 2000 RESOLVED FIXED resolved P2 normal --- 1 noah_mendelsohn cmsmcq www-xml-schema-comments oldest_to_newest 6526 0 noah_mendelsohn 2005-09-28 13:19:28 +0000 Although we have taken IEEE754r as a prime motivation for doing precisionDecimal, we seem not to follow the precedent for other types, in that we do not say in so many words: "this type is intended, with a few exceptions described below, to represent the values of IEEE754r floating point decimal", or whatever the right way to say this is. The exceptions include the fact that we have only a single NaN, and maybe some others I'm forgetting. Furthermore, it might be useful to state non-normatively, in an appendix or otherwise, what the correspondences are. I.e. to explain how to map value space properties such as artithmeticPrecision to their equivalents in IEEE754r. 7220 1 sandygao 2005-11-18 17:44:37 +0000 Discussed at 2005-11-18 telecon. RESOLUTION: Phase 1 agreement: Editors to work with Noah to draft such a Note, and identify a location for it, bring back to the WG. 7474 2 cmsmcq 2005-12-16 00:01:25 +0000 Dave Peterson sent a proposal to the WG on 18 November, proposing that the sentence The special values are introduced to make the datatype correspond closely to the floating-point decimal datatypes described by the forthcoming revision of IEEE/ANSI 754. be replaced by This datatype is introduced to make a variant of decimal that corresponds more closely to the floating-point decimal datatypes described by an expected forthcoming revision of IEEE/ANSI 754. "Precision" of values is retained, and the special values (two zeros, infinities, and not-a-number) are added to that end. Unless I'm mistaken, this is now ready for WG action. I've revised the summary statement to make it more revealing when truncated by Bugzilla's list view. 7598 3 cmsmcq 2006-01-04 13:43:06 +0000 Two amended versions have been proposed in email recently: (A) speaks of "the" revision of 754, not "a" revision, and moves "to that end". Diffed against the earlier proposal, it is: This datatype is introduced to make a variant of decimal that corresponds more closely to the floating-point decimal datatypes described by [an]^the^ expected forthcoming revision of IEEE/ANSI 754. ^To that end,^ "Precision" of values is retained, and the special values (two zeros, infinities, and not-a-number) are added [to that end]. (B) follows (A) but deletes "to that end" entirely: This datatype is introduced to make a variant of decimal that corresponds more closely to the floating-point decimal datatypes described by [an]^the^ expected forthcoming revision of IEEE/ANSI 754. "Precision" of values is retained, and the special values (two zeros, infinities, and not-a-number) are added [to that end]. 7739 4 cmsmcq 2006-01-09 16:39:47 +0000 After further discussion, the editors have converged on the following wording (similar to B, but with 'provide' instead of 'make'): This datatype is introduced to provide a variant of decimal that corresponds more closely to the floating-point decimal datatypes described by [an]^the^ expected forthcoming revision of IEEE/ANSI 754. "Precision" of values is retained, and the special values (two zeros, infinities, and not-a-number) are added [to that end]. 7740 5 cmsmcq 2006-01-09 16:42:39 +0000 The ^ (add) and [] (deletion) markings appear to cause some confusion. The clear-text form of the editors' consensus proposal is: This datatype is introduced to provide a variant of decimal that corresponds more closely to the floating-point decimal datatypes described by the expected forthcoming revision of IEEE/ANSI 754. "Precision" of values is retained, and the special values (two zeros, infinities, and not-a-number) are added. 7742 6 noah_mendelsohn 2006-01-09 18:08:42 +0000 I still am a bit confused about the phrase "more closely", as we don't say more closely than what. I'd be tempted to leave out the word "more", leaving: "This datatype is introduced to provide a variant of decimal that corresponds more closely to the floating-point decimal datatypes described by [an]^the^ expected forthcoming revision of IEEE/ANSI 754." Not worth a lot of discussion if we don't get pretty quick consensus. Thanks! Noah 7744 7 noah_mendelsohn 2006-01-09 19:42:16 +0000 What I meant to say was: I still am a bit confused about the phrase "more closely", as we don't say more closely than what. I'd be tempted to leave out the word "more" (and moving the word "closely"), leaving: "This datatype is introduced to provide a variant of decimal that closely corresponds to the floating-point decimal datatypes described by [an]^the^ expected forthcoming revision of IEEE/ANSI 754." Not worth a lot of discussion if we don't get pretty quick consensus. Thanks! Noah 7843 8 cmsmcq 2006-01-15 00:31:47 +0000 At its telcon of 13 January, the WG adopted the proposal in comment 5 as amended by comment 7. The change was integrated into the status quo documents of 13 January.