用XSL语言实现Get到AddChange的转换

<?xml version="1.0" encoding="UTF-8"?>
<Changes>
    <Change id="1" type="Add">
        <Description>Added new user</Description>
    </Change>
    <Change id="2" type="Delete">
        <Description>Deleted old user</Description>
    </Change>
</Changes>

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0"
    xmlns:xsl="http://www.w3.org/1999/XSL/Transform">

    <!-- 模板匹配根节点 -->
    <xsl:template match="/">
        <AddChanges>
            <!-- 模板匹配所有Change节点 -->
            <xsl:apply-templates select="Changes/Change"/>
        </AddChanges>
    </xsl:template>

    <!-- 模板匹配类型为Add的Change节点 -->
    <xsl:template match="Change[@type='Add']">
        <AddChange>
            <Id><xsl:value-of select="@id"/></Id>
            <Description><xsl:value-of select="Description"/></Description>
        </AddChange>
    </xsl:template>

</xsl:stylesheet>

xsltproc transform.xsl changes.xml

<?xml version="1.0"?>
<AddChanges>
    <AddChange>
        <Id>1</Id>
        <Description>Added new user</Description>
    </AddChange>
</AddChanges>