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Re: [xsl] [XPath 3.0] Can anonymous functions return markup?


Subject: Re: [xsl] [XPath 3.0] Can anonymous functions return markup?
From: Olivier JEULIN <olivier.jeulin@xxxxxxxxx>
Date: Tue, 18 Dec 2012 11:10:00 +0100

Hi Dimitre,
you are calling the ghost of future XMas^H^HL developers upon you with
this solution ;-)
I clearly heard all the web_developersb" saying "Ohhh! Finally! I can
generate XML in a sensible way".

2012/12/17 Dimitre Novatchev <dnovatchev@xxxxxxxxx>:
> Now, this is a pure XPath way :)   :
>
> <xsl:stylesheet version="3.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
>  xmlns:xs="http://www.w3.org/2001/XMLSchema"
>  xmlns:my="my:my" exclude-result-prefixes="my xs">
>  <xsl:output omit-xml-declaration="yes" indent="yes"/>
>
>  <xsl:template match="/">
>    <xsl:sequence select=
>    "let $print := function () as element()
>                     {
>                        parse-xml('&lt;hello>World&lt;/hello>')/*
>                     }
>        return ($print())
>    "/>
>  </xsl:template>
> </xsl:stylesheet>
>
>
> On Sun, Dec 16, 2012 at 3:38 PM, Dimitre Novatchev <dnovatchev@xxxxxxxxx>
wrote:
>> No, there are no standard XPath ways to create a new node.
>>
>> But, given a function in the context of the XPath evaluator, this is
possible:
>>
>> <xsl:stylesheet version="3.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
>>  xmlns:xs="http://www.w3.org/2001/XMLSchema"
>>  xmlns:my="my:my" exclude-result-prefixes="my xs">
>>  <xsl:output omit-xml-declaration="yes" indent="yes"/>
>>
>>  <xsl:template match="/">
>>    <xsl:sequence select=
>>    "let $print := function () as element()
>>                     {
>>                        my:element('Hello', (), 'World')
>>                     }
>>        return ($print())
>>    "/>
>>  </xsl:template>
>>
>>  <xsl:function name="my:element" as="element()">
>>   <xsl:param name="pName" as="xs:string"/>
>>   <xsl:param name="pAttributes" as="attribute()*"/>
>>   <xsl:param name="pText" as="xs:string?"/>
>>
>>   <xsl:element name="{$pName}">
>>    <xsl:sequence select="$pAttributes"/>
>>    <xsl:sequence select="$pText"/>
>>   </xsl:element>
>>  </xsl:function>
>> </xsl:stylesheet>
>>
>> produces:
>>
>> <Hello>World</Hello>
>>
>> Similarly, the function my:element() can be written in XQuery.
>>
>>
>> Cheers,
>>
>> Dimitre
>>
>> On Sun, Dec 16, 2012 at 2:07 PM, Costello, Roger L. <costello@xxxxxxxxx>
wrote:
>>> Hi Folks,
>>>
>>> I want to create an anonymous XPath function that returns markup. For
example:
>>>
>>>          let $print := function ()
>>>                               {
>>>                                   <hello>World</hello>
>>>                               }
>>>          return ($print())
>>>
>>> I tried embedding that XPath within an xsl:sequence element:
>>>
>>>       <xsl:sequence select="
>>>          let $print := function ()
>>>                               {
>>>                                   <hello>World</hello>
>>>                               }
>>>          return ($print())
>>>          " />
>>>
>>> but that produced this error message:
>>>
>>>     The value of attribute "select" associated with an element
>>>     type "xsl:sequence" must not contain the '<' character.
>>>
>>> So I escaped the '<' characters:
>>>
>>>       <xsl:sequence select="
>>>          let $print := function ()
>>>                               {
>>>                                   &lt;hello>World&lt;/hello>
>>>                               }
>>>          return ($print())
>>>          " />
>>>
>>> and that produced this error message:
>>>
>>>     Unexpected token "<" in path expression
>>>
>>> Is it possible to create an anonymous function that returns markup?
>>>
>>> If yes, how?
>>>
>>> /Roger
>>>
>
>
>
> --
> Cheers,
> Dimitre Novatchev
> ---------------------------------------
> Truly great madness cannot be achieved without significant intelligence.
> ---------------------------------------
> To invent, you need a good imagination and a pile of junk
> -------------------------------------
> Never fight an inanimate object
> -------------------------------------
> To avoid situations in which you might make mistakes may be the
> biggest mistake of all
> ------------------------------------
> Quality means doing it right when no one is looking.
> -------------------------------------
> You've achieved success in your field when you don't know whether what
> you're doing is work or play
> -------------------------------------
> Facts do not cease to exist because they are ignored.
> -------------------------------------
> Typing monkeys will write all Shakespeare's works in 200yrs.Will they
> write all patents, too? :)
> -------------------------------------
> I finally figured out the only reason to be alive is to enjoy it.
>



--

O. J.


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