[DFDL-WG] Binary decimal virtual point - unparsing behaviour

[Steve Hanson]

Sorry, but I need a clarification on this. 

Spec says ""When unparsing a binary number (packed decimal or 
twos-complement) and excess precision is supplied in the Infoset no 
rounding occurs. It is a processing error.""

Technically, precision is the number of digits, and trailing zeros are 
significant even after a decimal point. 

So is it a processing error if I supply an infoset decimal value of 123.
990 and a BDVP of 2?  While this can be serialized to an integer, the 
original decimal has excess precision.

Similarly for an infoset decimal value of 12300.0 and a BDVP of -2. This 
can be serialized to an integer, but the original decimal has excess 
precision.

What this amounts to is whether we give a processing error a) whenever the 
infoset supplies excess precision, or b) only when the excess precision 
results in a decimal that can't be converted into an integer.
 
Regards
 
Steve Hanson
Architect, IBM DFDL
Co-Chair, OGF DFDL Working Group
IBM SWG, Hursley, UK
smh at uk.ibm.com
tel:+44-1962-815848



From:   Steve Hanson/UK/IBM
To:     DFDL-WG <dfdl-wg at ogf.org>
Date:   09/12/2014 17:45
Subject:        Re: Binary decimal virtual point - unparsing behaviour


DFDL WG agreed that this is a processing error. 
http://redmine.ogf.org/issues/249

Regards
 
Steve Hanson
Architect, IBM DFDL
Co-Chair, OGF DFDL Working Group
IBM SWG, Hursley, UK
smh at uk.ibm.com
tel:+44-1962-815848




From:   Steve Hanson/UK/IBM
To:     DFDL-WG <dfdl-wg at ogf.org>
Date:   05/12/2014 11:05
Subject:        Binary decimal virtual point - unparsing behaviour


I am not finding anywhere in the DFDL spec that says explicitly what 
happens during unparsing when a decimal value is given to the unparser, 
and its rep is binary, and the BDVP is not sufficient to remove the 
decimal point from the value. This is surely a processing error, because 
the spec states in section 13.7.1 "When unparsing a binary number (packed 
decimal or twos-complement) and excess precision is supplied in the 
Infoset no rounding occurs. It is a processing error." 

Regards
 
Steve Hanson
Architect, IBM DFDL
Co-Chair, OGF DFDL Working Group
IBM SWG, Hursley, UK
smh at uk.ibm.com
tel:+44-1962-815848
Unless stated otherwise above:
IBM United Kingdom Limited - Registered in England and Wales with number 
741598. 
Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU


Unless stated otherwise above:
IBM United Kingdom Limited - Registered in England and Wales with number 
741598. 
Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU

Unless stated otherwise above:
IBM United Kingdom Limited - Registered in England and Wales with number 
741598. 
Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU
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