That solves the problem of showing the headers, but I also need to loop over

some values, compute an appropriate value to output, and then follow the 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"/>
</xsl:for-each>

  <xsl:value-of select="foo/f:compute-value(.)"
separator="{$field-separator}"/>

How can I output a tab (hex 9) without also getting the space (hex 20)

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