Re: Basics of XSLT

http://xmltwig.com/article/index_wtr.html

'ways to rome' series is good ... there is also a bit of perl specific
xml advice to be had at http://www.perlmonks.com

hth, Jim Fuller

On Tue, Mar 10, 2009 at 11:54 AM, Nic Gibson <nicg@xxxxxxxxxx> wrote:
> 2009/3/10 himanshu padmanabhi <himanshu.padmanabhi@xxxxxxxxx>:
>> Thank you.Can anyone explain XPath more?
>>
>> I was advised to use "XML::LibXSLT::xpath_to_string" in the following
code.
>>
>>  my $parser = XML::LibXML->new();
>>  my $xslt = XML::LibXSLT->new();
>>
>>  my $source = $parser->parse_file($xmlfile);
>>  my $style_doc = $parser->parse_file($xslfile);
>>
>>  my $stylesheet = $xslt->parse_stylesheet($style_doc);
>>
>>  my $results = $stylesheet->transform($source,
>> XML::LibXSLT::xpath_to_string(args => "$in{'args'}",value => "$value",
>> cnt => "1",);
>>
>>  print $stylesheet->output_string($results);
>>
>
> Hello again.
>
> One thing you might find useful is the perl-xml mailing list (take a
> look at http://aspn.activestate.com/ASPN/Mail/Browse/Threaded/perl-xml).
>
> I'll try and answer your question about xpath_to_string. In xslt the
> value of a parameter (or variable) is an xpath exrpession in something
> like:
>
> <xsl:param name='myparam' select='foo'/>
>
> That is, we aren't talking about the string 'foo' here, we are talking
> about the element 'foo'. Now, that is like to not be what you mean in
> a global parameter (one at stylesheet level as opposed to a local
> param at template level). A string must be quoted in an xpath
> expression:
>
> <xsl:param name='myparam' select="'foo'"/> <!-- double quote with
> single quoted string inside it -->
>
> So... going back to perl - xpath_to_string converts a perl string to
> the quoting format required by xslt.
>
> The input to the function is a hash (or an array of key/value pairs).
> Basically the function takes every second argument and quotes it. It
> then returns the processed array. So, the result of:
>
> XML::LibXSLT::xpath_to_string(args => "$in{'args'}",value => "$value",
>  cnt => "1",)
>
> will be
>
> ('args' => "'xxx'", 'value' => "'yyy'", 'cnt', => "'1'"); # double
> quoted strings containing single quoted values
>
> where xxx and yyy are the values of $in{'args'} and $value respectively.
>
> I think I gave you an incorrect answer yesterday because I suggested
> xpath_to_string('foo') - don't do that, do as you were doing before
> (xpath_to_string('foo', 'bar')).
>
>
> cheers
>
> nic
>
> --
> Nic Gibson
> Director, Corbas Consulting
> Editorial and Technical Consultancy
> http://www.corbas.co.uk/