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RE: RE : Comparison of Xml documents

• To: "'Rich Salz'" <rsalz@d...>
• Subject: RE: RE : Comparison of Xml documents
• From: "Alessandro Triglia" <sandro@m...>
• Date: Tue, 25 Nov 2003 16:43:55 +0900
• Cc: "'John Cowan'" <cowan@m...>, "'Bob Wyman'" <bob@w...>, "'Alaric B Snell'" <alaric@a...>, <xml-dev@l...>
• Importance: Normal
• In-reply-to: <Pine.LNX.4.44L0.0311230843400.10361-100000@s...>

Rich Salz wrote:
> 
> > **Roughly speaking**, WXS "sequence"s are mapped to ASN.1 
> SEQUENCEs, 
> > while WXS "all"s are mapped to ASN.1 SEQUENCEs plus explicit 
> > information about the order.  The order is made a part of 
> the abstract 
> > type definition and so is made available to the ASN.1 application.
> 
> Hm.  This means an XML->ASN1/xER gateway must possibly 
> re-order elements within an all?  Could be expensive, having 
> to buffer the entire all, right?


Why is it expensive?  

As elements are parsed from the stream, each element can be decoded into the
corresponding component of the SEQUENCE (matched by name), and an enumerator
value identifying the component can be appended to the "order" component
(the list of enumerator values).  Why do you say one has to buffer the
entire "all"?

Alessandro


>         /r$
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> Rich Salz                  Chief Security Architect
> DataPower Technology       http://www.datapower.com
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