fop + json

[Sam Fuqua <sa...@gmail.com>]

Hi,

I know that this isn't within the bounds of the w3 standard, but I was
wondering if FOP has any way of handling JSON.
For example, if I have:
<root>
<element>
{"menu":{"key":"value","id":"idnum"}}
</element>
</root>
, is there any way to xpath into the JSON in the text node?  I've seen it
used in another xml parser, but wasn't sure if it's possible to reference
element/menu/id in my XSL when I'm creating an FO document.

-- 
Sam Fuqua
ΣΝ ΘΗ 454

Re: fop + json

[Sam Fuqua <sa...@gmail.com>]

Andreas,

Thank you for such a quick and clear reply.  I will try to find a way to
parse the json elsewhere.

Sam

On Tue, May 19, 2009 at 1:16 PM, Andreas Delmelle <
andreas.delmelle@telenet.be> wrote:

> On 19 May 2009, at 19:05, Sam Fuqua wrote:
>
> Hi Sam
>
>
>  I know that this isn't within the bounds of the w3 standard, but I was
>> wondering if FOP has any way of handling JSON.
>> For example, if I have:
>> <root>
>> <element>
>> {"menu":{"key":"value","id":"idnum"}}
>> </element>
>> </root>
>> , is there any way to xpath into the JSON in the text node?  I've seen it
>> used in another xml parser, but wasn't sure if it's possible to reference
>> element/menu/id in my XSL when I'm creating an FO document.
>>
>
> Not possible with FOP, I'm afraid, since JSON is Javascript, and unrelated
> to XML.
> To a general XML parser, the content of the element node is simply a text
> node. FOP has no embedded script engine to parse and evaluate it as a
> Javascript object.
>
> The only way to get the value of the 'id' attribute of the object in
> standard XML/XSLT would thus be using something like:
>  substring-before(substring-after(/root/element,'"id":"'),'"}')
>
> Another route would be to translate the JSON object to XML, parse it as
> such, and then use normal XPath to get the requested attribute from
> something like:
>
> <root><element><menu key="value" id="idnum" /></element></root>
> or
> <root><element><menu><key>value</key><id>idnum</id></menu></element></root>
>
> Regards
>
> Andreas
>
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>


-- 
Sam Fuqua
ΣΝ ΘΗ 454

Re: fop + json

[Andreas Delmelle <an...@telenet.be>]

On 19 May 2009, at 19:05, Sam Fuqua wrote:

Hi Sam

> I know that this isn't within the bounds of the w3 standard, but I  
> was wondering if FOP has any way of handling JSON.
> For example, if I have:
> <root>
> <element>
> {"menu":{"key":"value","id":"idnum"}}
> </element>
> </root>
> , is there any way to xpath into the JSON in the text node?  I've  
> seen it used in another xml parser, but wasn't sure if it's possible  
> to reference element/menu/id in my XSL when I'm creating an FO  
> document.

Not possible with FOP, I'm afraid, since JSON is Javascript, and  
unrelated to XML.
To a general XML parser, the content of the element node is simply a  
text node. FOP has no embedded script engine to parse and evaluate it  
as a Javascript object.

The only way to get the value of the 'id' attribute of the object in  
standard XML/XSLT would thus be using something like:
  substring-before(substring-after(/root/element,'"id":"'),'"}')

Another route would be to translate the JSON object to XML, parse it  
as such, and then use normal XPath to get the requested attribute from  
something like:

<root><element><menu key="value" id="idnum" /></element></root>
or
<root><element><menu><key>value</key><id>idnum</id></menu></element></ 
root>

Regards

Andreas

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