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[xsl] Can xsl:iterate be used in stream-processing?


Subject: [xsl] Can xsl:iterate be used in stream-processing?
From: "Costello, Roger L. costello@xxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>
Date: Wed, 17 Sep 2014 09:39:11 -0000

Hi Folks,

I am trying to stream-process this web site which emits a continuous stream of
XML:

http://xmpp.wordpress.com:8008/firehose.xml?type=text/plain

Ergo, I use xsl:stream like so:

        <xsl:stream
href="http://xmpp.wordpress.com:8008/firehose.xml?type=text/plain">
            ...
        </xsl:stream>

The XML that the web site delivers consists of an infinitely long sequence of
Atom <entry> elements. I want to iterate through them and keep a running
count. Ergo, I embed xsl:iterate inside xsl:stream like so:

        <xsl:stream
href="http://xmpp.wordpress.com:8008/firehose.xml?type=text/plain">
            <xsl:iterate select="stream/atom:entry ">
                <xsl:param name="count" select="1" as="xs:integer"/>
                ...
            </xsl:iterate>
        </xsl:stream>

However, that results in Saxon throwing this error:

  The body of the xsl:stream instruction is not guaranteed streamable
according to W3C rules
  *  Context item expression (.) in a navigational context is free-ranging

I conclude that xsl:iterate cannot be used in stream-processing. Correct?

/Roger


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