Given a variable with a sequence of values

<xsl:variable name="values" select="(1,2,3,4,5)" as="xs:double+"/>

these are three methods to report its content:

<xsl:sequence select="for $i in 1 to count($values) return $values[$i]"/>

<xsl:for-each select="1 to count($values)">
     <xsl:sequence select="$values[.]"/>
</xsl:for-each>

<xsl:for-each select="1 to count($values)">
     <xsl:sequence select="$values[current()]"/>
</xsl:for-each>

Why not simply
  <xsl:sequence select="$values"/>
?

Or if you want to use a for expression why the need to use a positional
index, why can't you use
  for $i in $values return $i
?