Tracking position in recursive functions?

Hi,

These is just the part of str::tokenize.

I just want to ask how to track "position" in recursive functions like
"str:_tokenize-delimiters"?

"position()" isn't solving the purpose.

"$args" value is "-p 10 -t 20 abcd.domain.com" which I want to
tokenize by space.

What my final goal is,
If called with position()=1 then print 2nd pos = 10
If called with position()=2 then print 4nd pos = 20
If called with position()=3 then print 5nd pos = abcd.domain.com
(There are 3 xml elements so str:tokenize can be called 3 times or I
call it 1 time and save 2,4,5 values in variables and can print it in
calling template.)

Currently it is printing all the tokens each time.
Tracking 'position' in recursive function also can give me answer like
2nd,4th,5th position token.

<xsl:stylesheet version="1.0"
                xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                xmlns:str="http://exslt.org/strings"
                extension-element-prefixes="str">

<xsl:template name="str:_tokenize-delimiters">
  <xsl:param name="args" />
  <xsl:param name="delimiters" />

  <xsl:variable name="delimiter" select="substring($delimiters, 1, 1)" />

  <xsl:choose>
        <xsl:when test="not($delimiter)" >
            <option><xsl:value-of select="$args" /></option>
        </xsl:when>

    <xsl:when test="contains($args, $delimiter)">
        <option><xsl:value-of select="substring-after($args,
$delimiter)" /></option>
        <xsl:if test="not(starts-with($args, $delimiter))">
            <xsl:call-template name="str:_tokenize-delimiters">
                <xsl:with-param name="args"
select="substring-before($args, $delimiter)" />
                <xsl:with-param name="delimiters"
select="substring($delimiters, 2)" />
            </xsl:call-template>
        </xsl:if>

        <xsl:call-template name="str:_tokenize-delimiters">
            <xsl:with-param name="args" select="substring-after($args,
$delimiter)" />
            <xsl:with-param name="delimiters" select="$delimiters" />
        </xsl:call-template>
    </xsl:when>

    <xsl:otherwise>
        <xsl:call-template name="str:_tokenize-delimiters">
            <xsl:with-param name="args" select="$args" />
            <xsl:with-param name="delimiters"
select="substring($delimiters, 2)" />
        </xsl:call-template>
    </xsl:otherwise>
  </xsl:choose>
</xsl:template>

</xsl:stylesheet>
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Thanks and Regards,
Himanshu Padmanabhi