RE: Validating a duration

> I am having difficulty writing a Schematron validation for a 
> duration.

Hi Robert. 
 Would this be easier using Saxon 7, with the date time 
arithmetic of XSLT 2.0?

regards DaveP

 The 
> (simplified) XML is as follows:
> 
> <entry>
>      <start-date>20030726</start-date>
>       <start-time>13:00</start-time>
>       <end-time>15:30</end-time>
>       <duration>
>           <hours>2</hours>
>           <minutes>30</minutes>
>       </duration>
> </entry>
> 
> I need to validate that the duration hours and minutes are 
> correct and this 
> is relatively easily achieved (see below) for all but the 
> edge case where 
> the end-time is at midnight, i.e. 00:00
> 
> <sch:let name="currentStartTimeSecs" 
> value="number(substring(start-time, 
> 1,2))*60 + number(substring(start-time,4,2))"/>
> <sch:let name="currentEndTimeSecs" value="number(substring(end-time, 
> 1,2))*60 + number(substring(end-time,4,2))"/>
> <sch:let name="currentCalculatedDurationSecs" 
> value="$currentEndTimeSecs - 
> $currentStartTimeSecs"/>
> 
> <sch:assert test="$currentCalculatedDurationSecs =
>                                   
> (number(normalize-space(duration/hours))*60 
> + number(normalize-space(duration/minutes)))"/>
> 
> Is there any way to detect that the end-time is 00:00 and adjust the 
> currentEndTimeSecs accordingly ?
> 
> Robert
> 
> 
> 
> 
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