Re: different evaluations on sibling elements ...

On 27 Aug 2013, at 18:18, Raimund Kammering wrote:

> okay I tried this but mixed up the relative path expressions and the
location step 
>
> But still puzzling:
> The change brought me to:
> "XPTY0004: A sequence of more than one item is not allowed as the first
argument of"
>
> So I changed the lines to be:
>
>>>> <xsl:variable name="next"
select="dateTime($entry/following-sibling::entry/isodate,
$entryfollowing-sibling::entry/time)"/>
> <xsl:variable name="next"
select="dateTime($entry/following-sibling::entry[1]/isodate,
$entry/following-sibling::entry[1]/time)"/>

Again, sorry for making this all-too-common mistake!

> to only get the first following-sibling. Which brought me the following
error:
> "XPTY0004: Cannot divide two durations of different type"
>
> pointing to the line
>>>> <xsl:sequence select="($next - $this) div xs:duration('PT1H')"/>

It should have been xs:dayTimeDuration('PT1H') rather than xs:duration.
>
> Here I have a hard time understanding the formats - especially since I did
not use the XSLT 2.0 dataTime so far. Is't $this, $next simply in ISO8601 date
format of the form YYYY-MM-DDTHH:mm:ss - if so the subtraction already should
already not be okay?

If I've got it right, isodate contains a date of the form 2013-02-09, and time
contains a time of the form 23:00:00. So in fact there are two ways to
construct a dateTime instance, and I gave you a mixture of the two.

(a) use string concatenation followed by a cast:

xs:dateTime(concat(isodate, 'T', time))

(b) convert both components separately and then use the fn:dateTime() function
to combine them:

dateTime(xs:date(isodate), xs:time(time))

Sorry for making a bit of a pig's ear of it!

Michael Kay
Saxonica


>
> Raimund Kammering
>
> On 27.08.2013, at 18:37, Michael Kay <mike@xxxxxxxxxxxx> wrote:
>
>> Yes, sorry, a mistake I often make: within the function, all the relative
path expressions should start with $entry. So
>>
>>>> <xsl:variable name="this" select="dateTime($entry/isodate,
$entry/time)"/>
>>>> <xsl:variable name="next"
select="dateTime($entry/following-sibling::entry/isodate,
$entryfollowing-sibling::entry/time)"/>
>>
>> Michael Kay
>> Saxonica