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Re: XPath expression that generates false plus a messa

Subject: Re: XPath expression that generates false plus a message?
From: Michael Kay <mike@xxxxxxxxxxxx>
Date: Mon, 25 Apr 2011 21:51:49 +0100
Re:  XPath expression that generates false plus a messa
I used the XPath expression within the new XML Schema 1.1<assert> element:

     <xs:element name="meeting">
         <xs:complexType>
             <xs:sequence>
                 <xs:element name="start" type="xs:time" />
                 <xs:element name="end" type="xs:time" />
             </xs:sequence>
             <xs:assert test="if (xs:time(start) gt xs:time(end)) then
                                                      true()
                                                else
                                                       trace(false(), 'Hey, the meeting ends before it begins!')" />
         </xs:complexType>
     </xs:element>

Here is a<meeting> with bad data:

<meeting>
      <start>10:00:00</start>
      <end>09:00:00</end>
</meeting>


Your assertion is true if the start time is greater than the end time. Which is the case for your "bad" data.


(Note also that comparing times is an error-prone business: what happens if you have a meeting that starts at 23:00 and finishes at 01:00?)

Michael Kay
Saxonica

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