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RE: XPath context of p:wrap-sequence/@group-adjacent

From: <Toman_Vojtech@emc.com>
Date: Tue, 8 Jun 2010 02:18:24 -0400
Message-ID: <997C307BEB90984EBE935699389EC41C01916709@CORPUSMX70C.corp.emc.com>
To: <xproc-dev@w3.org>
Romain,

I believa that both Calabash and Calumet behave correctly. The
group-adjacent XPath expression (after its value is constructed by the
XProc processor) is passed to and evaluated by the XProc *step*. If you
look at section 2.6.1.2, where the "step XPath context" is discussed,
you will see that no variable bindings are defined in the step context
(unless otherwise specified by specific steps - see for instance
p:label-elements).

See section 2.6 in the specification for a brief discussion of the
difference between the processor XPath context and the step XPath
context.

Regards,
Vojtech

--
Vojtech Toman
Principal Software Engineer
EMC Corporation
toman_vojtech@emc.com
http://developer.emc.com/xmltech


> -----Original Message-----
> From: xproc-dev-request@w3.org [mailto:xproc-dev-request@w3.org] On
Behalf Of
> Romain Deltour
> Sent: Friday, June 04, 2010 11:54 PM
> To: xproc-dev@w3.org
> Subject: XPath context of p:wrap-sequence/@group-adjacent
> 
> Hi XProc-ers,
> 
> Should the in-scope variables and options be available as variable
> binding in the XPath context when evaluating the @group-adjacent
> expression of a p:wrap-sequence step ?
> 
> The spec says: "The XPath context for the group-adjacent option
> changes over time. For each document that appears on the source port,
> the expression is evaluated with that document as the context
> document. The context position (position()) is the position of that
> document within the sequence and the context size (last()) is the
> total number of documents in the sequence."
> 
> but nothing is said about in-scope options and variables... I then
> assume that they should be available (as per the general description
> of XPath context in XProc).
> 
> The following pipeline raises XPathExceptions in both Calabash and
> Calumet, which (as far as I understand) would be a bug:
> 
> <p:declare-step xmlns:p="http://www.w3.org/ns/xproc" version="1.0">
> 
>    <p:input port="source" sequence="true">
>      <p:inline>
>        <doc/>
>      </p:inline>
>      <p:inline>
>        <doc/>
>      </p:inline>
>    </p:input>
> 
>    <p:variable name="myvar" select="2">
>      <p:empty/>
>    </p:variable>
>    <p:wrap-sequence wrapper="wrapper" group-adjacent="position() =
> $myvar"/>
>    <p:sink/>
> 
> </p:declare-step>
> 
> Thanks,
> Romain.
> 
Received on Tuesday, 8 June 2010 06:19:42 GMT

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