(Q9) List the titles of books published by Morgan Kaufmann in 1998.

FOR $b IN document("bib.xml")//book
WHERE $b/publisher = "Morgan Kaufmann"
AND $b/year = "1998"
RETURN $b/title

XSLT equivalent to (Q9)

<xsl:transform version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
  <xsl:template match="/">
    <xsl:for-each select="document('bib.xml')//book">
      <xsl:if test="publisher='Morgan Kaufmann' and year='1998'">
        <xsl:copy-of select="title"/>
      </xsl:if>
    </xsl:for-each>
  </xsl:template>
</xsl:transform>

Or, bring it all up into the path expression...

<xsl:transform version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
  <xsl:template match="/">
    <xsl:copy-of select="document('bib.xml')//book[publisher='Morgan Kaufmann' and year='1998']/title">
  </xsl:template>
</xsl:transform>