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RE: bohemians, gentry

• To: "David Carlisle" <davidc@n...>,<jonathan.robie@d...>
• Subject: RE: bohemians, gentry
• From: "Dare Obasanjo" <dareo@m...>
• Date: Thu, 5 Dec 2002 07:36:23 -0800
• Cc: <xml-dev@l...>
• Thread-index: AcKb/DwJM9e1nOVdSfmj4JzsaZZWfQAdh/nM
• Thread-topic: bohemians, gentry

Can you point me to the text in any of the working drafts that says that an implementation should infer types for data and strip out unrelated information? The only time your statement is true is if <Weight> typed as a schema type and thus was converted from a PSVI to the XQuery data model. In this case since the PSVI doesn't mandate retaining comments and it may be costly for implementations to store both the typed value and the untyped node structure then the data loss you describe may occur. However I don't see how different this is from the XPath 1.0 query 
 
  number(/A) 
 
giving me 
 
  12 
 
for the XML 
 
 <A>01<!-- comment may be lost -->2</A>
 
So really what has changed? If you want to deal with untyped data then don't use schema types. You can't have your cake and eat it too. 
 

	-----Original Message----- 
	From: David Carlisle [mailto:davidc@n...] 
	Sent: Wed 12/4/2002 5:03 PM 
	To: jonathan.robie@d... 
	Cc: xml-dev@l... 
	Subject: Re:  bohemians, gentry
	
	


	> As far as I can tell, XQuery and XSLT will both allow you to process data
	> in this way.
	
	No, they won't as Xquery's bias towards schema typing means that an
	implementation is allowed to just use the typed value and junk the
	original lexical string so if the original was
	<Weight>123.456</Weight>
	you might get away with it but if it's
	<Weight>0<!--I added this leading 0 for a reason-->123.4560</Weight>
	a query processor is allowed to report that as
	<Weight>123.456</Weight>
	and information is lost. It is lost because Xquery views the stated
	typing as more important than the XML markup. It is essentially not an
	XML processing language at all; it is language for querying typed trees.
	
	David
	
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