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Re: I output a tab character, then the output file co

Subject: Re: I output a tab character, then the output file contains space, tab, space ... why?
From: "Costello, Roger L. costello@xxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>
Date: Fri, 8 Apr 2016 16:34:48 -0000
Re:  I output a tab character
Hi Folks,

Thank you very much Martin, Michael, and Eliot. Simply superb.

Below I summarize the problem and the solution.

Problem Statement:

The below XSLT program loops over each value in a sequence and separates the
sequence values by a tab (hex 9) character. When the output file is opened in
a hex editor we see 3 characters separating the sequence values:

	space (hex 20), tab (hex 9), and space (hex 20)

Problem: How can we avoid getting space characters surrounding the tab?

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

    <xsl:output method="text" />

    <xsl:variable name="headers" select="('A', 'B')"/>
    <xsl:variable name="field-separator" select="codepoints-to-string(9)"/>

    <xsl:template match="/">
        <xsl:for-each select="$headers">
            <xsl:sequence select="." />
            <xsl:sequence select="$field-separator"/>



The following value-of element will generate the desired output, without space
(hex 20) characters surrounding the tab (hex A) character:

      <xsl:value-of select="$headers" separator="{$field-separator}"/>

Here is an alternate (equivalent) solution which uses XPath to solve the

      <xsl:sequence select="string-join($headers, $field-separator)"/>

Problem #2:

Unlike the above case, in this case there is not a predetermined sequence of
values to be output. Rather, the sequence of values to be output are
determined at run-time. We need to loop over some values, compute an
appropriate value to output, and then follow the output value with a tab (hex
9). Like this:

<xsl:for-each select="foo">
	<xsl:variable name="value" select="f:compute-value(.)"/>
	<xsl:sequence select="$value" />
	<xsl:sequence select="$field-separator"/>

Problem: How can we output a tab (hex 9) without also getting the space (hex
20) characters surrounding the tab character?


Replace the above loop with this value-of element:

      <xsl:value-of select="f:get-sequence($foo)"

Create a function which returns just the sequence of values (no field

<xsl:function name="f:get-sequence" as="xs:string*">
	<xsl:param name="foo" />

	<xsl:for-each select="foo">
		<xsl:variable name="value" select="f:compute-value(.)"/>
		<xsl:sequence select="$value" />


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