RE: [EXI LC comments] Mapping from xs:float and xs:double to exi:Float and vice versa

Mohamed,
 
Thank you for your question regarding the the EXI Float data type representation. One of the advantages of using a base 10 representation is that it avoids rounding issues when moving floating point data between EXI and text XML and between EXI and an application that use the standard XML interfaces. XML, EXI and the standard XML interfaces all use a base 10 representation for floating point numbers, so no rounding issues will occur in these circumstances. 
 
You are correct that rounding issues may occur when moving floating point data between EXI and a base 2 representation. These rounding issues will be identical to those that occur moving floating point data between text XML and a base 2 representation, so EXI maintains the same behavior as XML in these cases. As such we avoid introducing any *new* rounding issues. Any work-arounds developed to address rounding issues for text XML will continue to work for EXI.
 
I hope this helps to explain our rationale. Please let us know if you have follow-up questions or comments. 
 
    Thank you,
 
    John
 
    AgileDelta, Inc.
     <http://www.agiledelta.com/> http://www.agiledelta.com
 
  
From: Innovimax SARL <innovimax@gmail.com <mailto:innovimax@gmail.com?Subject=Re%3A%20%5BEXI%20LC%20comments%5D%20Mapping%20from%20xs%3Afloat%20and%20xs%3Adouble%20to%20exi%3AFloat%20and%20vice%20versa&In-Reply-To=%253C546c6c1c0809191117i477ab4a0y57219ee29eac41e5%40mail.gmail.com%253E&References=%253C546c6c1c0809191117i477ab4a0y57219ee29eac41e5%40mail.gmail.com%253E> > 
Date: Fri, 19 Sep 2008 20:17:58 +0200
Message-ID: <546c6c1c0809191117i477ab4a0y57219ee29eac41e5@mail.gmail.com> 
To: public-exi-comments@w3.org <mailto:public-exi-comments@w3.org?Subject=Re%3A%20%5BEXI%20LC%20comments%5D%20Mapping%20from%20xs%3Afloat%20and%20xs%3Adouble%20to%20exi%3AFloat%20and%20vice%20versa&In-Reply-To=%253C546c6c1c0809191117i477ab4a0y57219ee29eac41e5%40mail.gmail.com%253E&References=%253C546c6c1c0809191117i477ab4a0y57219ee29eac41e5%40mail.gmail.com%253E>  



Dear,



The format for double seems richer than IEEE 754 float and double that

are respectively used for xs:float and xs:double



But the fact that base 10 is used instead of base 2 will imply

rounding issues for float and double



How do you consider to work around that ?



Regards



Mohamed ZERGAOUI



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Innovimax SARL

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