在for-each中使用xsl:if根据当前属性值进行过滤

<books>
  <book>
    <title>Book 1</title>
    <author>Author 1</author>
  </book>
  <book>
    <title>Book 2</title>
    <author>Author 2</author>
  </book>
  <book>
    <title>Book 3</title>
    <author>Author 1</author>
  </book>
</books>

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
  <xsl:template match="/">
    <xsl:for-each select="books/book">
      <xsl:if test="author = 'Author 1'">
        <xsl:value-of select="title"/>
        <br/>
      </xsl:if>
    </xsl:for-each>
  </xsl:template>
</xsl:stylesheet>

Book 1
Book 3