Another xslt1 version (as for Dimitre's this works also in xslt2 as
written, with version="1.0" but if you make it version="2.0" and turn off
backward compatibilty mode, you get a type error).
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>
<xsl:output method="text"/>
<xsl:template match="/">
<xsl:param name="optional.one" select="true()" />
<xsl:param name="optional.two" select="true()" />
<xsl:param name="optional.three" select="true()" />
<xsl:value-of select="substring('1 1.702.253 ',
1+4*($optional.one + $optional.two + $optional.three),
4)"/>
</xsl:template>
</xsl:stylesheet>
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