使用xslt进行属性转换

<?xml version="1.0" encoding="UTF-8"?>
<books>
    <book id="1">
        <title>Book One</title>
        <author>Author One</author>
        <price currency="USD">19.99</price>
    </book>
    <book id="2">
        <title>Book Two</title>
        <author>Author Two</author>
        <price currency="EUR">15.99</price>
    </book>
</books>

<?xml version="1.0" encoding="UTF-8"?>
<bookList>
    <book>
        <title>Book One</title>
        <author>Author One</author>
        <price currency="USD">19.99</price>
    </book>
    <book>
        <title>Book Two</title>
        <author>Author Two</author>
        <price currency="EUR">15.99</price>
    </book>
</bookList>

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

    <xsl:output method="xml" indent="yes"/>

    <xsl:template match="/">
        <bookList>
            <xsl:apply-templates select="books/book"/>
        </bookList>
    </xsl:template>

    <xsl:template match="book">
        <book>
            <title><xsl:value-of select="title"/></title>
            <author><xsl:value-of select="author"/></author>
            <price currency="{price/@currency}"><xsl:value-of select="price"/></price>
        </book>
    </xsl:template>

</xsl:stylesheet>