W3C home > Mailing lists > Public > public-exi@w3.org > July 2008

[EXI] N Bit encoding

From: santhanakrishnan <santhana@huawei.com>
Date: Wed, 09 Jul 2008 09:12:50 +0530
To: public-exi@w3.org
Message-id: <000001c8e175$dd0f74a0$4a18120a@china.huawei.com>
Hi EXI Experts
        For the encoding of N-Bit Unsigned integer I feel the EXI
specification has some contradictions. Especially when it is used for
representing the Bounded Integer type from Schema.
Perception 1:
        When in the bounded integer the range is within 4095 then the offset
from mininclusive is encoded. When the range is greater than 4095 then
Integer encoding is suggested for the same. 
        For Integer encoding of positive number - 0(boolean) number(unsigned
int) would be encoded
        For Integer encoding of negative number - 1(boolean) number(unsigned
int) would be encoded
Perception 2:
        This is from the Table 7-1. Built-in EXI Datatypes. Here it says 
* For integer without minInclusive or minExclusive facets, or with
minInclusive or minExclusive facet of negative value(-ve Number) - Integer
* For nonNegativeInteger or integer with minInclusive or minExclusive facet
value of 0 or above(+ve number) - Unsigned Integer
There is a contradiction for the encoding of positive number when the range
is greater than 4095 in the above cases.  The sign bit 0(boolean) is extra
in case 1. Which approach has to be followed ? I observed that the prevalent
EXI implementation Agile Delta is following case 2 for bounded integers when
they are out of bounds and positive. Please clarify in this regard.
Received on Wednesday, 9 July 2008 03:49:35 UTC

This archive was generated by hypermail 2.3.1 : Tuesday, 6 January 2015 19:52:43 UTC