RE: [sdo] [NEW ISSUE]: Remove the {property '.' index_from

From a C++ point of view where all arrays are indexed with 0 it is more intuitive for some of our customer base to use the .0 syntax. It makes using the data object more intuitive for people who have mainly used 0 based indexing in the past. You don’t have to use the .0 base indexing if you want to just use [1]. Removing it from the specs first forces everyone to do it one way that might not be familiar or intuitive for them. Secondly, it would be breaking usage for people who are use to SDO that have always used the .0 syntax and migration could be a real pain.

I brought this next point up briefly in the F2F, but I think it relates to this issue too. Things that make the SDO language specific seem like a bad idea to include in the SDO spec. Since different languages use 0 base indexing vs. 1 base indexing it seems pretty great to have the spec include both ways as convince since I would say most programmers are from a 0 based indexed system yet a 1 based index system is used in several systems as well.

Thanks,

James

From: Yang,Hongbo [mailto:yanghb@primeton.com]
Sent: Thursday, January 24, 2008 1:27 AM
To: sdo@lists.oasis-open.org
Subject: [sdo] [NEW ISSUE]: Remove the {property '.' index_from_0} from sdo xpath syntax

Hi all,

In SDO2.1 ,there is both

| property '.' index_from_0

and

| property '[' index_from_1 ']'

in syntax of xpath.

It has two defects : firstly,index_from_0 is not subset of xpath as described in SDO 2.1

secondly, '.' is not conveniently to combime with OGNL or web FrameWork.

So i suggest to remove the '.' index_from_0 from SDO in 3.0

Thanks,

Hongbo

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