Thanks. I think either your and my understanding of roundtrip is flawed, or Unicode Services understands it differently, or I am missing something.
Charles -----Original Message----- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@bama.ua.edu] On Behalf Of Tony Harminc Sent: Tuesday, June 12, 2012 12:02 PM To: IBM-MAIN@bama.ua.edu Subject: Re: Anyone a Unicode Services expert? -- roundtrip conversion On 12 June 2012 13:59, Charles Mills <charl...@mcn.org> wrote: > Fair enough. Unicode services reports however that it supports roundtrip > conversion in many of these cases, including for example, 37 to 850 (pretty > basic ASCII). What does roundtrip conversion mean? That is my fundamental > question. The CDRA Reference and Registry book (SC09-2190-00 - admittedly rather old...) says this about Round Trip Integrity (in a larger section on Criteria for Character Set Mismatch Management): "The objective of this criterion is to send data from one system to another one that has different representations of character data, and retrieve it without loss. Often the "do not convert" choice is not available. For example, data stored in a System/370 database is configured to have all its graphic character data in one CCSID. If it acts as a remote repository for data from a PC application, or from an application in another System/370 using a different CCSID, the data must be converted to the configured CCSID. The data is intended to be retrieved by the same application without loss when it is converted back for use in its original CCSID." There's more, but I think the notion of Round Trip Integrity is clear enough. And having typed that in with the recollection that this book was not available online, I see that there is an updated version at http://www-01.ibm.com/software/globalization/cdra/ The bit I quoted is in chapter 6. Tony H. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: INFO IBM-MAIN
