Re[2]: [xsl] finding position() of an element in a different context

[Kevin Burges <xmldude@xxxxxxxxxxxxxxxx>]

Hi Jeni,

JT> Hi Kevin,

>> I've remembered another part of the problem. Look at the structure
>> again:
>>
>> <top>
>>     <visits>
>>           <visit id="visit1Name"/>
>>           <visit id="visit2Name"/>
>>     </visits>
>>     <formtypes>
>>         <formtype id="formtype1Name"/>
>>         <formtype id="formtype2Name"/>
>>     </visits>
>>     <forms>
>>         <form visit="visit1Name" formtype="formtype1Name"/>
>>         <form visit="visit1Name" formtype="formtype2Name"/>
>>         <form visit="visit2Name" formtype="formtype2Name"/>
>>     </forms>
>> </top>
>>
>> Am I not right in saying that if I am in the context of a <visit>
>> element, doing:
>>
>>   <xsl:variable name="matchingForm"
>>   select="//forms/form[(@formtypeID = $formtypeID) and (@visitID =
>>   $visitID)]"/>
>>
>> will not work, because "//forms" is taken relative to the context
>> node? Certainly this seems to be happening, as no matches are
>> occurring.



JT> So //forms gets all forms elements in the document.  In
JT> fact you just want:
JT>   /top/forms
JT> since there's only one forms element that you're actually interested
JT> in and you know where that is.

actually this is not quite the case ( I was simplifying in the
previous example), there could be form emelents in
various places. The match I am actually looking for is

    //sequential//form

as I could have

...
    <sequential>
        <forms>
            <start>
                <form ....... />
                <form ....... />
            </start>
            <form ........ />
            <form ........ />
            <end>
                <form ....... />
                <form ....... />
            </end>
        </forms>
    </sequential>
...


JT> The reason your XPath won't work is that you're looking for a
JT> 'formtypeID' attribute and a 'visitID' attribute on each form element,
JT> whereas the attributes that are there are called 'formtype' and
JT> 'visit'.

again sorry, that was just a typo.


JT> You might also be interested in using a key to retrieve the relevant
JT> form.  You could create a key that uses both the visit and the
JT> formtype to index the form elements:

JT> <xsl:key name="forms"
JT>          match="form"
JT>          use="concat(@formtype, ':', @visit)" />

JT> You can then retrieve the relevant form with:

JT>   key('forms', concat($formtypeID, ':', $visitID))

This sounds promising, so I tried it. At first it again did not work.
While testing I noticed that I was setting variables as follows:

   <xsl:variable name="formtypeID"><xsl:value-of select="@id"/></xsl:variable>

When I change this to:

   <xsl:variable name="formtypeID" select="@id"/>

Everything started working fine. Is the first returning the text value
of @id, while the second is actually returning the attribute node
itself or something??

-- 
groovy baby,
 Kevin                            mailto:xmldude@xxxxxxxxxxxxxxxx

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