xsl中对xml数据的排序和筛选

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要对xml中的数据用xsl按一定的条件进行排序或是按条件过滤时，事实上xsl已经为我们提供了很好的支持，现在举一个对xml数据进行排序和过滤的例子：

xml文件：

<?xml version="1.0" encoding="utf-8"?>

<?xml-stylesheet type="text/xsl" href="messages2.xsl"?>

<to>JoannaF</to>

<from>LindaB</from>

<date>04 September 2001</date>

<subject>meeting tomorrow</subject>

<body>can you tell me what room the committee meeting will be in?</body> </message>

<to>JoannaF</to>

<from>JohnH</from>

<date>04 September 2000</date>

<subject>I updated the site</subject>

<body>I've posted the lastest updates to our internal web site,as you requested</body>

</message> <message id="123">

<to>JoannaF</to>

<from>LindaB</from>

<date>05 September 2001</date>

<subject>re:meeting tomorrow</subject>

<body>Thanks.by the way,do not forget to bring your notes from the conference</body>

</message>

</messages>

现在需要根据date进行升序排序：进行升序排序的xsl文件如下：

<?xml version="1.0" encoding="utf-8"?>

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">

<xsl:template match="/">

<xsl:apply-templates/>

</body>

</html>

</xsl:template>

<xsl:template match="messages">

<xsl:for-each select="//message">

<xsl:sort select="date" order='ascending'/>

Date: <xsl:value-of select="date"/>

To: <xsl:value-of select="to"/>

From: <xsl:value-of select="from"/>

<xsl:value-of select="body"/>

</xsl:for-each>

</xsl:template>

</xsl:stylesheet>

需要按照一定筛选条件进行筛选时的xsl为：

<?xml version="1.0" encoding="utf-8"?>

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">

<xsl:template match="/">

<html>

<body>

<xsl:apply-templates/>

</body>

</html>

</xsl:template>

<xsl:template match="messages">

<xsl:for-each select="//message" >

<xsl:if test="@id!='109'">

Date: <xsl:value-of select="date"/>

To: <xsl:value-of select="to"/>

From: <xsl:value-of select="from"/>

<xsl:value-of select="body"/>

</xsl:if>

</xsl:for-each>

</xsl:template>

</xsl:stylesheet>