Re: Modify Value of a Parameter Globally Within a Tem

That approach worked perfectly. Thank you for all the help!

On Mon, Nov 12, 2012 at 1:45 PM, Michael Kay <mike@xxxxxxxxxxxx> wrote:
>
> On 12/11/2012 18:20, Lisa Jiang wrote:
>>
>> Hi Michael,
>>
>> Yes so the input is information that I get from an HTTP request. This
>> information consists of a descriptor that tells whether our query for
>> the website was a match for the information on the website. It also
>> consists of information from the website. I then need to process the
>> information based on the descriptor. However, sometimes the descriptor
>> is incorrect. So I first want to call another template to check
>> whether or not the descriptor is correct based on the information and
>> change it if it is incorrect, since it affects processing later on. At
>> output, I generate a comment based on the descriptor as well as the
>> website information post-processing.
>
>
> OK, great.
>
> The functional approach to this is a pipeline.
>
> First compute the "corrected descriptor" in a variable. If the descriptor is
> already correct, this is trivially the same as the input descriptor. If the
> input descriptor is incorrect, then the correct descriptor is some
> transformation of the input descriptor.
>
> Then do some processing using the corrected descriptor as input.
>
> Schematically:
>
> <xsl:variable name="correctedDescriptor"
>   select="if (f:descriptorIsCorrect($descriptor)) then $descriptor else
> f:applyCorrection($descriptor)"/>
>
> <xsl:template match="/">
>   <xsl:sequence select="f:doTheWork(., $correctedDescriptor)"/>
> </xsl:template>
>
> I've written this using functions rather than templates for brevity but the
> logic is the same either way.
>
> Michael Kay
> Saxonica
>
>
>>
>> So for example:
>> Our query
>> Brand: Haagen Daaz
>> Flavor: Chocolate
>> Price: $5.99
>>
>> Website return:
>> Descriptor: Found
>> Brand: Haagen Dazs
>> Price: $5.99
>>
>> The descriptor should say "Similar Found." So then I would check
>> whether or not the brand names are exactly the same, and, if not, I
>> would change the descriptor.
>>
>> So then instead of outputting (incorrectly):
>> Descriptor: Found
>> Comment: Exact match
>> Brand: Haagen Daaz
>> Price: $5.99
>>
>> The correct output would be:
>> Descriptor: Similar Found
>> Comment: Error in brand name
>> Brand: Haagen Dazs
>> Price: $5.99
>>
>> Thanks!
>> Lisa
>>
>>
>>> -------- Original Message --------
>>> Subject: Re:  Modify Value of a Parameter Globally Within a Template
>>> Date: Mon, 12 Nov 2012 17:21:55 +0000
>>> From: Michael Kay <mike@xxxxxxxxxxxx>
>>> Reply-To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
>>> To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
>>>
>>>
>>> On 12/11/2012 17:07, Lisa Jiang wrote:
>>>>
>>>> Dear All,
>>>>
>>>> Is there a specific way to change the value of a parameter within a
>>>> call to another template and then use the resulting value for tests in
>>>> the original template? Or just change the value of a parameter within
>>>> a template that then reflects globally? I've included some simple,
>>>> example code on what I would like to do.
>>>>
>>>>
>>> No, you can't do it this way: this isn't the way functional languages
>>> work.
>>>
>>> If you can step up a couple of levels and describe the problem (that is,
>>> the input and output of the transformation and their relationship to
>>> each other) then we can try and find the right approach for you.
>>>
>>> Michael Kay
>>> Saxonica