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List:       xsl-list
Subject:    Re: [xsl] Upgrading version should lead to bug - right?
From:       Michael Kay <mike () saxonica ! com>
Date:       2012-09-13 7:38:51
Message-ID: 50518D8B.8080009 () saxonica ! com
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On 13/09/2012 08:16, Ihe Onwuka wrote:
> I have an XSLT 1.0 stylesheet that has been running on an XSLT 2.0
> processor no problem but barfs when you upgrade the version attribute
> (no other change to the code) to 2.0.
>
> That shouldn't happen right?
No, it's entirely possible that it will happen. Once you set the version 
attribute to 2.0, you enable XSLT 2.0's stronger type checking. For 
example, in XSLT 1.0, contains(author, "abc") works fine if there is 
more than one author (it just takes the first, and ignores the others), 
while XSLT 2.0 gives you the type error that you are reporting.

If the stylesheet author's intent was to select the first item and 
ignore the others (a common example is contains(following-sibling::*, 
"xyz")) then the fix is to make this explicit: change it to 
contains(following-sibling::*[1], "xyz"). But sometimes, when you look 
at the code, you realize that the stylesheet author simply didn't take 
into account the possibility that the expression might select more than 
one node.
>
> I've not pinned down the precise line of offending code but the error
> I am getting is
>
> A sequence of more than one item is not allowed as the first argument
> of contains() ("_IOS, _WEB, _CTV", "_IOS, _WEB, _CTV", ...)
>
> Now the input XML has elements like this
>
> <m__category>_IOS, _WEB, _CTV</m__category>
>
> so I wonder if the processor is parsing that element as a sequence
> instead of as a comma separated string.
No, your first argument to contains() has selected more than one string. 
The first string is "_IOS, _WEB, _CTV", the second string is exactly the 
same, and subsequent strings (if they exist) are not listed in the error 
message.

Michael Kay
Saxonica

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