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Re: XPath and prefix bindings

• From: Ivan Pedruzzi <ivanpedruzzi@gmail.com>
• To: Fraser Goffin <goffinf@gmail.com>
• Date: Wed, 15 Aug 2012 19:02:25 -0400

Hi Fraser,

Stylus Studio XPath Query editor declares the namespace prefixes
automatically based on the document you are querying.
http://www.stylusstudio.com/xpath_evaluator.html

Hope this helps
Ivan Pedruzzi
Stylus Studio Team



On Wed, Aug 15, 2012 at 6:28 PM, Fraser Goffin <goffinf@gmail.com> wrote:
> Jeff,
>
> I agree. So from that I would assume that neither XMLSpy nor any of
> the other online Xpath evaluators were actually providing the complete
> set of prefix bindings prior to evaluation of the expression (except
> for those declared on the root element). Certainly if I was writing
> code to consume this XML and apply XPath expression to it I would need
> to provide the bindings apriori.
>
> Incidentally where did those two paragraphs come from ?
>
> Fraser.
>
> On 15/08/2012, Jeff Greif <jeff.greif@gmail.com> wrote:
>> I believe the following describes how namespaces are used in XPath
>> application.
>>
>> Essentially, a dictionary of prefix -> namespace pairs must be available
>> for all the prefixes used in the XPath prior to application of the XPath
>> to a particular node in the document.  This dictionary may come from the
>> prefix -> namespace pairs in scope at that context node, or be provided
>> by the code that applies the XPath.
>>
>> The prefixes used in the XPath may be considered to have been replaced,
>> before the XPath is applied to the document, by the corresponding
>> namespaces, and have no relation to the prefixes used in the document.
>> Then when a node is matched against a step in the XPath, the namespace
>> for the XPath step is matched against the namespace to which the
>> namespace prefix in the document resolves.
>>
>> Jeff
>>
>>
>> On 8/15/2012 1:01 PM, Fraser Goffin wrote:
>>> Thanks Andrew, you're right I did miss the NS1 declaration on the
>>> Evens element, however even when added I still get the sa me error ?
>>>
>>> Fraser.
>>>
>>> On 15 August 2012 19:44, Andrew Welch <andrew.j.welch@gmail.com> wrote:
>>>>> <dis:Numbers xmlns:dis="urn:numbers">
>>>>>         <NS1:Odds xmlns:NS1="urn:numbers">
>>>>>                 <NS1:One>1</NS1:One>
>>>>>                 <NS1:Three>3</NS1:Three>
>>>>>                 <NS1:Five>5</NS1:Five>
>>>>>         </NS1:Odds>
>>>>>         <NS1:Evens>
>>>>>                 <NS1:Two>2</NS1:Two>
>>>>>                 <NS1:Four>4</NS1:Four>
>>>>>                 <NS1:Six>6</NS1:Six>
>>>>>         </NS1:Evens>
>>>>> </dis:Numbers>
>>>>
>>>>> If however I add the declaration for NS1 to the root element the XPath
>>>>> locates the node with no problem
>>>>
>>>>> What am I mis-understanding here ?
>>>>
>>>> It's not namespace well formed because the NS1 prefix on Evens isn't
>>>> mapped... as you say moving the declaration so that it's in scope for
>>>> NS1:Evens fixes the problem.
>>>>
>>>>
>>>> --
>>>> Andrew Welch
>>>> http://andrewjwelch.com
>>>
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>>
>
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• References:
  • XPath and prefix bindings
    • From: Fraser Goffin <goffinf@gmail.com>
  • Re: XPath and prefix bindings
    • From: Andrew Welch <andrew.j.welch@gmail.com>
  • Re: XPath and prefix bindings
    • From: Fraser Goffin <goffinf@gmail.com>
  • Re: XPath and prefix bindings
    • From: Fraser Goffin <goffinf@gmail.com>