Re: ISBN Proposal

On Fri, 05 Jan 2007 15:32:26 +0100, Philippe Jausions <Philippe.Jausions@11abacus.com> wrote:

Tom, Very good indeed. What might be done is to have the Structure_ISBN or Numeric_ISBN package for the conversion & version identification, and reuse that package in Validate_ISPN to do more thorough validation. Although it would probably be Validate2_ISPN instead due to PHP 4 vs. 5... One thing that is a little bit odd to me is your syntax: new ISBN('ISBN 992-2878783-0');

Yeah that's because as of the defintion by the yearbook 2001 even this is a valid ISBN because "ISBN" should be printed before any ISBN. this is the main fact i put it in. there is even something related to a specific language for the languages which do not use latin chars normally.

Why put the "ISBN" in the string at all? That seems out of place. you do not need to anyway. the minimum requirement in this case would be 99228787830.

-Tom

-Philippe Tom Klingenberg wrote: hi phillipe, shure i did. that was the first thing i was doing back in july 2006 to find out where it fits in and if it's possible to extend an existing package. validate_ISPN takes it only on the checksum side, meaning, that it validates against the checkdigit only. the isbn class i linked to handles this kind of validation as well as validation of the different parts. it can even tell if the isbn is about an german, english or publication in azerbaijanian language and if the registrants number is correct in terms of length. comparing both validations with each other, Validate_ISPN would return TRUE on ISBN numbers ISBN would strictly tell you FALSE. don't get me wrong, validate_ISPN does the job it claims on ISBN numbers (checksum validation) and often this is the needed check. what is complementary next to the differences in validation is the fact that Validate_ISPN takes care about validation only. my suggested ISBN draft does a few things more: * conversion - convert ISBN 10 to ISBN 13 numbers right away * version identification - pass an ISBN and the class can guess and validtate its ISBN version * extraction - get prefix, groupidentifier, registrant and title as well as the checkdigit (that can lead to many more stuff like reformatting etc. but is mainly read only right now) these are the main differences by functionality. by code, ISBN is compatible to php 5 and up, validate_ISPN is php4 compatible. i think it's the main difference there. --tom On Thu, 04 Jan 2007 19:34:11 +0100, Philippe Jausions <Philippe.Jausions@11abacus.com> wrote: Tom, Have you already looked at http://pear.php.net/package/Validate_ISPN ? Without your code it's impossible to tell if it's complementary to that package... -Philippe