This is one of the good reasons to use general comparisons (">" rather 
than "gt"). A general comparison will also succeed in comparing the 
value from a document that hasn't been schema validated. In that case 
the atomic value extracted from the XML document will have a type of 
xs:untypedAtomic, which the general comparison will automatically cast 
to the type of the other value compared - in this case an xs:date.

John

Michael Kay wrote:
> Yes, this would succeed if element x were validated as an element of type
> xs:date.
> 
> The reason is that operators like "gt" that expect an atomic value, if given
> a node as an argument, will automatically "atomize" the node. This extracts
> the typed value, which in this case is an atomic value of type xs:date.
> 
> Michael Kay
> http://www.saxonica.com/ 
> 
>> -----Original Message-----
>> From: Mukul Gandhi [mailto:gandhi.mukul@g...] 
>> Sent: 09 May 2009 05:38
>> To: xsl-list@l...
>> Subject: [xsl] Schema aware XPath 2.0 doubt
>>
>> Hi all,
>>    Let's say, I have following XML document:
>>
>> <x>2008-12-01</x>
>>
>> And the following XPath 2.0 expression,
>>
>> [1]
>> x gt xs:date('2007-12-01')
>>
>> The evaluation of this expression fails, with non schema 
>> aware XSLT 2.0/XPath 2.0 system (as x is not of type xs:date. 
>> it's actually an element).
>>
>> But if we had a Schema aware XSLT 2.0/XPath 2.0 system, and 
>> the above XML document was validated with a Schema (with 
>> element x being assigned a Schema type xs:date), would the 
>> above XPath 2.0 expression succeed in this case (i.e., with a 
>> Schema aware XPath 2.0 system)?
>>
>> The XPath 2.0 specification for operator, op:date-greater-than (ref,
>> http://www.w3.org/TR/xpath-functions/#func-date-greater-than)
>> specifies:
>>
>> op:date-greater-than($arg1 as xs:date, $arg2 as xs:date) as xs:boolean
>>
>> which makes me think that, both arguments to the operator 
>> 'gt' must be of type xs:date. So the XPath 2.0 expression [1] 
>> would fail in case of Schema aware system also.
>>
>> Could somebody please clarify this to me.
>>
>>
>> --
>> Regards,
>> Mukul Gandhi
>>
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-- 
John Snelson, Oracle Corporation            http://snelson.org.uk/john
Berkeley DB XML:            http://oracle.com/database/berkeley-db/xml
XQilla:                                  http://xqilla.sourceforge.net

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