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[xsl] How to stream-process non-XML text using unparsed-text-lines( ) ?

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Hi Folks,

In Abel Braaksma's XML London paper he writes:

This paper discusses streaming of XML, but XPath 3.0
introduces a new function, fn:unparsed-text-lines,
which takes an external resource as input and parses it
line by line. The original intent of that function was to
allow unparsed data to be streamed; however, the
Working Group at some point decided to not formalize
this requirement. But, the specification leaves
enough room for implementers to allow streamed
processing of data read through this function. When
your intention is to do streaming of unparsed input, you
should check the capabilities of your processor to find
out whether it can do streaming using this function.

Neat!

So, I have two questions:

1. Do any XSLT processors support streaming of non-XML text using
unparsed-text-lines( )?

2. Suppose the XSLT processor is streaming the strings returned from calling
unparsed-text-lines( ), how would I construct the XSLT program?

Example: Here is a non-XML text file:

Six Great Ideas/Mortimer J. Adler/1981/0-02-072020-3/Macmillan Publishing
Company
Illusions/Richard Bach/1977/0-440-34319-4/Dell Publishing Co.
The First and Last Freedom/J. Krishnamurti/1954/0-06-064831-7/Harper &
Row

I want to stream-process it. I want to count the number of lines. Below is my
attempt at an XSLT program to implement this. I am not sure that the code even
makes sense. Does it? What is the right way to do it?  /Roger

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<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                version="3.0">

    <xsl:output method="xml" />

    <xsl:template match="/">
        <xsl:stream href="unparsed-text-lines('BookCatalogue.txt')">
            <count>
                <xsl:value-of select="count(tokenize(., '\n'))" />
            </count>
        </xsl:stream>
    </xsl:template>

</xsl:stylesheet>
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