markdown.xsl

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE xsl:stylesheet [
]>
<xsl:stylesheet
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
  xmlns:d="http://docbook.org/ns/docbook"
  version="1.0">

  <xsl:output method="text" encoding="UTF-8" />

  <xsl:variable name="newline">
    <xsl:text>&#xa;</xsl:text>
  </xsl:variable>

  <xsl:template match="d:literal">
    <xsl:text>`</xsl:text>
    <xsl:value-of select="." />
    <xsl:text>`</xsl:text>
  </xsl:template>

  <xsl:template match="d:emphasis">
    <xsl:text>*</xsl:text>
    <xsl:value-of select="." />
    <xsl:text>*</xsl:text>
  </xsl:template>

  <xsl:template match="d:book">
    <xsl:for-each select="d:info">
      <xsl:if test="d:title">
        <xsl:text># </xsl:text>
        <xsl:value-of select="d:title"/>
        <xsl:value-of select="$newline" />
      </xsl:if>

      <xsl:if test="d:subtitle">
        <xsl:text>## </xsl:text>
        <xsl:value-of select="d:subtitle"/>
        <xsl:value-of select="$newline" />
      </xsl:if>
    </xsl:for-each>

    <xsl:for-each select="d:preface">
      <xsl:if test="d:title">
        <xsl:text># </xsl:text>
        <xsl:value-of select="d:title"/>
        <xsl:value-of select="$newline" />
      </xsl:if>

      <xsl:if test="d:subtitle">
        <xsl:text>## </xsl:text>
        <xsl:value-of select="d:subtitle"/>
        <xsl:value-of select="$newline" />
      </xsl:if>

      <xsl:for-each select="d:para">
        <xsl:value-of select="normalize-space(.)"/>
        <xsl:value-of select="$newline" />
        <xsl:value-of select="$newline" />
      </xsl:for-each>
    </xsl:for-each>

    <xsl:value-of select="$newline" />

  </xsl:template>

</xsl:stylesheet>