Malformed version in stylesheet

A processor reads version as a decimal to decide which language it runs. A value that is no decimal, such as 2,0, 2e0, or an empty string, names no version, so one processor may reject the stylesheet and another run it under rules the author never chose. Write a decimal such as 2.0.

Incorrect:

<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="2,0">
  <xsl:template match="/">
    <xsl:value-of select="count(item)"/>
  </xsl:template>
</xsl:stylesheet>

Correct:

<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="2.0">
  <xsl:template match="/">
    <xsl:value-of select="count(item)"/>
  </xsl:template>
</xsl:stylesheet>

Every version on an XSLT element and xsl:version on a literal result element is checked, except version on xsl:output, which names the output method's version.