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Re: [xsl] xslt 3.0 possible feature - some sort of collection to help when streaming
Subject: Re: [xsl] xslt 3.0 possible feature - some sort of collection to help when streaming|
From: Wendell Piez <wapiez@xxxxxxxxxxxxxxxx>
Date: Thu, 10 Mar 2011 15:02:59 -0500
This doesn't speak to the requirement itself (which seems perfectly
legit to me), but only to the use case.
One approach to achieving the aims here is to reverse the order of
operations. The first pass doesn't emit the messages, but simply
generates elements in a namespace reserved for the purpose. The second
pass strips them out, while emitting messages for them as it goes.
This approach works well when you are not set on using xsl:message as
the reporting channel. For example, the messages can instead be siphoned
to a separate document. Or, as you suggest, higher-level analysis of the
message set can be conducted.
Needless to say, this is all a piece of cake in XSLT 2.0 with or without
XProc. Or if you like, two pieces of cake.
On 3/10/2011 1:28 PM, Andrew Welch wrote:
Often we 'hack' xsl:message to output some information to post process
later, and it struck me that it would be useful to have a way of
accessing what has been sent to xsl:message during the same transform.
This would be especially useful when streaming, as processing the
data twice for different purposes is less than ideal.
For example, you for-each over some data but want to also do something
with @names later:
[ process each item ]
<xsl:message select="concat('Processed ', @name)"/>
then later in the same template, say to create an index or list of links:
[ process the items stored earlier 'Processed name1' , 'Processed name2' etc ]
Is there anything conceptually wrong with this, other than the
non-guaranteed order of processing? If not, then it could be a proper
instruction rather than xsl:message, eg a top-level element to set it
<xsl:appender name="someAppender" option1="foo" option2="bar"/>
<xsl:append name="someAppender"> text to append</xsl:append>
and then to access it:
Wendell Piez mailto:wapiez@xxxxxxxxxxxxxxxx
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