[xsl] position() inside a for x to y

XSLT 2.0 XPath 2.0 Saxon 8

I am creating an xml-fo file that has several options for table column
headers which are stored in variables like:

<xsl:variable name="colhead-size"
select="'1.5cm','1.5cm','1.5cm','proportional-column-width(1)','2cm','2cm','
2cm','2cm'"/>

Then, in the xslt I loop like this to create the fo:table-columns:


                <xsl:for-each select="1 to count($colhead-names)">
                        <xsl:variable name="pos" select="position()"/>
                        <fo:table-column>
                                <xsl:attribute name="column-width"
select="$colhead-size[$pos]"/>
                                <xsl:attribute name="text-align"
select="$colhead-align[$pos]"/>
                                <xsl:attribute name="column-number"
select="$pos"/>
                        </fo:table-column>
                </xsl:for-each>

This does work, however this does not work when I use the "position()"
directly:

                <xsl:for-each select="1 to count($colhead-names)">
                        <fo:table-column>
                                <xsl:attribute name="column-width"
select="$colhead-size[position()]"/>
                                <xsl:attribute name="text-align"
select="$colhead-align[position()]"/>
                                <xsl:attribute name="column-number"
select="$pos"/>
                        </fo:table-column>
                </xsl:for-each>

This gives me the entire node set so I get:
        <fo:table-column column-width="1.5cm 1.5cm 1.5cm
proportional-column-width() 2cm etc." ...

My question is: why do I have to save position() to a variable to use it
properly in the for-each loop?

Rick


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