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RE: Can message expression of p:identity access items flowing through if it is a sequence of items and not a single item?

From: Erik Siegel <erik@xatapult.nl>
Date: Thu, 8 Jul 2021 16:51:56 +0200
To: "'Martin Honnen'" <martin.honnen@gmx.de>, <xproc-dev@w3.org>
Message-ID: <001f01d77408$cc593e00$650bba00$@xatapult.nl>
Hi Martin,

Interesting edge case, but I think your findings and the ingenious solution are correct. Something for XProc Vnext...?

Erik Siegel

-----Original Message-----
From: Martin Honnen <martin.honnen@gmx.de> 
Sent: Thursday, 8 July 2021 15:54
To: xproc-dev@w3.org
Subject: Can message expression of p:identity access items flowing through if it is a sequence of items and not a single item?


Hi,

I haven't been doing any XProc 3 for a while and I am currently struggling to find a way to check I get the wanted output out of a step; I thought I could do that by adding a step p:identity with a message e.g.

   <p:identity message="{. instance of array(*)}"/>


This works if a single item flows through but as soon as I have a sequence of items flowing through I get an error that the context item is needed but not provided.

So I thought I could use a collection with <p:identity collection="true"
message="{every $item in collection() satisfies $item instance of array(*)}"/> but collection as an attribute doesn't seem to be allowed on p:identity.

Is the only way I have to debug what goes through the p:identity to precede my p:identity with a variable

     <p:variable name="result" collection="true" select="collection()"/>
     <p:identity message="{every $item in $result satisfies $item instance of array(*)}"/>


?
Received on Thursday, 8 July 2021 14:54:33 UTC

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