XML и XSL / Математика и XSLT

<xsl:template match="numbers">
  A. 4 + 3.2        = <xsl:value-of select="x + y"/>
  B. 3.2 - 4        = <xsl:value-of select="y - x"/>
  C. 4 * 3.2        = <xsl:value-of select="x * y"/>
  D. 11/3.2         = <xsl:value-of select="z div y"/>
  E. 4 + 3.2 * 11   = <xsl:value-of select="x+y*z"/>
  F. (4 + 3.2) * 11 = <xsl:value-of select="(x+y)*z"/>
  G. 11 mod 4       = <xsl:value-of select="z mod x"/>
  H. 4 + 3.2 + 11   = <xsl:value-of select="sum(*)"/>
  I. floor(3.2)     = <xsl:value-of select="floor(y)"/>
  J. ceiling(3.2)   = <xsl:value-of select="ceiling(y)"/>
  K. round(3.2)     = <xsl:value-of select="round(y)"/>
  L. 11 + count(*)  = <xsl:value-of select="11+count(*)"/>
  M. 3.2 + string-length("3.2") = 
     <xsl:value-of select="y + string-length(y)"/>
  N. 11 + "hello"     = <xsl:value-of select="z + 'hello'"/>
</xsl:template>