XML如何根据子组进行计数

Question

我有以下数据：

<countries>
    <continent name="Europe">
        <country>France</country>
        <country>United Kingdom</country>
        ...
    </continent>
    <continent name="North America">
        <country>Canada</country>
        <country>United States</country>
        ...
    </continent>
</countries>

<clients>
    <client>
        <name>John</name>
        <country>Canada</country>
    </client>
    ...
</clients>

我可以使用以下内容计算每个国家/地区的客户数量：

<xsl:key name="clientcountry" match="client" use="country"/>

<xsl:for-each select="countries//country">
    <xsl:value-of select="concat(., ': ', count(key('clientcountry', .)))"/>
</xsl:for-each>

我如何计算每个大陆的客户数量？

Answer 1

尝试

<xsl:for-each select="countries/continent">
    <xsl:value-of select="concat(@name, ': ', count(key('clientcountry', country)))"/>
</xsl:for-each>