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Re: [xsl] Re: dynamic xpath from variable evaluate function is failing


Subject: Re: [xsl] Re: dynamic xpath from variable evaluate function is failing
From: M Balaji <msbalaji82@xxxxxxxxx>
Date: Mon, 22 Oct 2012 13:38:50 +0530

Thanks Michael,

On Mon, Oct 22, 2012 at 1:31 PM, Michael Kay <mike@xxxxxxxxxxxx> wrote:
> If you evaluate
>
>
> <b test="(y=Unix) and (y=Solaris)">content</b>
>
> as an XPath expression the result will probably be false, because it means
>
> <b test="(child::y=child::Unix) and (child::y=child::Solaris)">content</b>
>
> and comparing two empty sequences using "=" gives false.

Yeah, that is why I'm adding text

<xsl:variable name="conlist"><s><xsl:for-each
>> select="document('config.xml')// condition"><xsl:element
>> name="{@name}">test</xsl:element><xsl:element
>> name="{@value}">test</xsl:element></xsl:for-each></s></xsl:variable>

>
> However, as far as I can tell the string value of conlist will be empty, so
> the expression you are constructing is
>
> $//[(y=Unix) and (y=Solaris)]

$conlist//s[(y=Unix) and (y=Solaris)] in $t

>
> which would be a syntax error.
>
> You would make your life a lot easier if the expressions in the conditions
> file used XPath syntax, that is, quotes around the values.
>
> Michael Kay
> Saxonica
>
>
>
>
>
> On 22/10/2012 06:41, M Balaji wrote:
>>
>> I need to construct the dynamic XPATH predicate from the input XML. I
>> tried
>> with evaluate function, but  its not converting the String to XPATH
>> predicate. Can any one let me know how can I achieve this?
>>
>>   Input: test.xml
>>
>> <a>
>>
>> <b test="(x=Windows)">content</b>
>>
>> <b test="(z=Unix)">content</b>
>>
>> <b test="(y=Unix) and (y=Solaris)">content</b>
>>
>> <b test="(z=Unix) and (y=Windows7)">content</b>
>>
>> </a>
>>
>> Configuration/condition evaluation file (config.xml)
>>
>> <root>
>>
>> <condition name="x" value="Windows8"/>
>>
>> <condition name="z" value="Unix"/>
>>
>> <condition name="y" value="Solaris"/>
>>
>> <condition name="y" value="Windows7"/>
>>
>> </root>
>>
>> XSLT: test.xsl
>>
>> <xsl:variable name="conlist"><s><xsl:for-each
>> select="document('config.xml')// condition"><xsl:element
>> name="{@name}">test</xsl:element><xsl:element
>> name="{@value}">test</xsl:element></xsl:for-each></s></xsl:variable>
>>
>> <xsl:template match="*[@test]">
>>
>> <xsl:param name="t" select="concat('$', conlist,'//s','[',@test,']')"/>
>>
>>
>>
>> <xsl:if test='saxon:evaluate("$p1",$t)'>
>>
>> <xsl:copy-of select="."/>
>>
>> </xsl:if>
>>
>>
>>
>> </xsl:template>
>>
>>
>> Result:
>>
>> I'm getting true for all above <b> elements
>>
>> Expected result:
>>
>> 1st and 3rd <b> should not printed in the output (condition is failing)
>>
>>
>> Thanks in Advance,
>>
>> Balaji. M
>>
>>
>> On Mon, Oct 22, 2012 at 11:04 AM, M Balaji <msbalaji82@xxxxxxxxx> wrote:
>>>
>>> I need to construct the dynamic XPATH predicate from the input XML. I
>>> tried
>>> with evaluate function, but  its not converting the String to XPATH
>>> predicate. Can any one let me know how can I achieve this?
>>>
>>>   Input: test.xml
>>>
>>> <a>
>>>
>>> <b test=3D=94(x=3DWindows)=94>content</b>
>>>
>>> <b test=3D=94(z=3DUnix)=94>content</b>
>>>
>>> <b test=3D=94(y=3DUnix) and (y=3DSolaris)=94>content</b>
>>>
>>> <b test=3D=94(z=3DUnix) and (y=3DWindows7)=94>content</b>
>>>
>>> </a>
>>>
>>> Configuration/condition evaluation file (config.xml)
>>>
>>> <root>
>>>
>>> <condition name=3D=94x=94 value=3D=94Windows8=94/>
>>>
>>> <condition name=3D=94z=94 value=3D=94Unix=94/>
>>>
>>> <condition name=3D=94y=94 value=3D=94Solaris=94/>
>>>
>>> <condition name=3D=94y=94 value=3D=94Windows7=94/>
>>>
>>> </root>
>>>
>>> XSLT: test.xsl
>>>
>>> <xsl:variable name=3D"conlist"><s><xsl:for-each
>>> select=3D"document('config.xml')// condition"><xsl:element
>>> name=3D"{@name}">test</xsl:element><xsl:element
>>> name=3D"{@value}">test</xsl:element></xsl:for-each></s></xsl:variable>
>>>
>>> <xsl:template match=3D=94*[@test]=94>
>>>
>>> <xsl:param name=3D"t" select=3D"concat('$',
>>> conlist,'//s','[',@test,']')"/>
>>>
>>>
>>>
>>> <xsl:if test=3D'saxon:evaluate("$p1",$t)'>
>>>
>>> <xsl:copy-of select=3D"."/>
>>>
>>> </xsl:if>
>>>
>>>
>>>
>>> </xsl:template>
>>>
>>>
>>> Result:
>>>
>>> I'm getting true for all above <b> elements
>>>
>>> Expected result:
>>>
>>> 1st and 3rd <b> should not printed in the output (condition is failing)
>>>
>>>
>>> Thanks in Advance,
>>>
>>> Balaji. M


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