• To: "'Berend de Boer'" <berend@x...>,"'xml-dev'" <xml-dev@l...>
• Subject: RE: XPath: what's the answre to True >= False
• From: "Michael Kay" <michael.h.kay@n...>
• Date: Fri, 6 Dec 2002 11:09:46 -0000
• Importance: Normal
• In-reply-to: <3DEFF04C.8050301@x...>
• Reply-to: <michael.h.kay@n...>

> When trying to create another XPath implementation I stumbled 
> upon the 
> somewhat complex conversion in paragraph 3.5: Booleans. To compare a 
> boolean and a node-set, both are converted to Booleans. For all 
> operators, including >= and <=. Can anyone tell me what:
> 
>     True >= False
>     False >= True
> 
Section 3.4 says "When neither object to be compared is a node-set and
the operator is <=, <, >= or >, then the objects are compared by
converting both operands to numbers and comparing the numbers according
to IEEE 754.

False <= True, because number(false()) = 0 and number(true()) = 1.

Suggestions as to how XPath 1.0 could have been improved are somewhat
academic at this point...

Michael Kay
Software AG
home: Michael.H.Kay@n...
work: Michael.Kay@s... 

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  • XPath: what's the answre to True >= False
    • From: Berend de Boer <berend@x...>

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