not-empty-atoms.xsl

<?xml version="1.0" encoding="UTF-8"?>
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<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" id="not-empty-atoms" version="2.0">
  <xsl:output encoding="UTF-8" method="xml"/>
  <xsl:template match="/program/errors">
    <xsl:copy>
      <xsl:apply-templates select="node()|@*"/>
      <xsl:for-each select="//o[@atom and o[@base]]">
        <xsl:element name="error">
          <xsl:attribute name="check">
            <xsl:text>not-empty-atoms</xsl:text>
          </xsl:attribute>
          <xsl:attribute name="line">
            <xsl:value-of select="@line"/>
          </xsl:attribute>
          <xsl:attribute name="severity">
            <xsl:text>error</xsl:text>
          </xsl:attribute>
          <xsl:text>The atom '</xsl:text>
          <xsl:value-of select="@name"/>
          <xsl:text>' may not have any attributes: </xsl:text>
          <xsl:for-each select="o[@base]">
            <xsl:if test="position() &gt; 1">
              <xsl:text>, </xsl:text>
            </xsl:if>
            <xsl:text>'</xsl:text>
            <xsl:value-of select="@name"/>
            <xsl:text>'</xsl:text>
          </xsl:for-each>
        </xsl:element>
      </xsl:for-each>
      <xsl:for-each select="//o[@atom and o[@atom]]">
        <xsl:element name="error">
          <xsl:attribute name="check">
            <xsl:text>not-empty-atoms</xsl:text>
          </xsl:attribute>
          <xsl:attribute name="line">
            <xsl:value-of select="@line"/>
          </xsl:attribute>
          <xsl:attribute name="severity">
            <xsl:text>error</xsl:text>
          </xsl:attribute>
          <xsl:text>Atom '</xsl:text>
          <xsl:value-of select="@name"/>
          <xsl:text>' may not have any attributes, even though they are atoms: </xsl:text>
          <xsl:for-each select="o[@atom]">
            <xsl:if test="position() &gt; 1">
              <xsl:text>, </xsl:text>
            </xsl:if>
            <xsl:text>'</xsl:text>
            <xsl:value-of select="@name"/>
            <xsl:text>'</xsl:text>
          </xsl:for-each>
        </xsl:element>
      </xsl:for-each>
    </xsl:copy>
  </xsl:template>
  <xsl:template match="node()|@*">
    <xsl:copy>
      <xsl:apply-templates select="node()|@*"/>
    </xsl:copy>
  </xsl:template>
</xsl:stylesheet>