我有一块看起来像这样的xml：
<root>
<tag1>tractor</tag1>
<tag2>
<subtag1 att="apple" />
<subtag2>
<subsubtag1>red</subsubtag1>
<subsubtag2>lunch</subsubtag2>
</subtag2>
</tag2>
<tag1>forklift</tag1>
<tag2>
<subtag1 att="pear" />
<subtag2>
<subsubtag1>green</subsubtag1>
<subsubtag2>breakfast</subsubtag2>
</subtag2>
</tag2>
<tag2>
<subtag1 att="apple" />
<subtag2>
<subsubtag1>green</subsubtag1>
<subsubtag2>dinner</subsubtag2>
</subtag2>
</tag2>
<tag1>combine harvester</tag1>
</root>
我需要对其进行转换,以便从每个tag2节点获取子标记2和3,但只有tag2节点,其中subtag1是apple.我还需要每个序列号.
我当前的代码看起来像这样：
<xsl:for-each select="//tag2">
<apple>
<seq_num><xsl:value-of select="position()" /></seq_num>
<colour><xsl:value_of select="subtag2" /></colour>
<meal><xsl:value_of select="subtag3" /></meal>
</apple>
</xsl:for-each>
这很好,除了我需要for-each只返回tag2,它们是苹果(即subtag1 = apple).我不能使用xsl：if或xsl：when因为那时序列号对于第二个苹果来说是不准确的.
有任何想法吗？
谢谢,
里克
要保持代码,应该像下面这样简单：
<xsl:for-each select="//tag2[subtag1/@att='apple']">
<apple>
<seq_num><xsl:value-of select="position()" /></seq_num>
<colour><xsl:value-of select="subtag2/subsubtag1" /></colour>
<meal><xsl:value-of select="subtag2/subsubtag2" /></meal>
</apple>
</xsl:for-each>
根据下面的评论,如建议的那样,最好避免使用//.你应该能够在正确的背景下.例如：
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" indent="yes"/>
<xsl:strip-space elements="*"/>
<xsl:template match="/root">
<xsl:for-each select="tag2[subtag1/@att='apple']">
<apple>
<seq_num><xsl:value-of select="position()" /></seq_num>
<colour><xsl:value-of select="subtag2/subsubtag1" /></colour>
<meal><xsl:value-of select="subtag2/subsubtag2" /></meal>
</apple>
</xsl:for-each>
</xsl:template>
</xsl:stylesheet>
根据您的输入,产生相同的结果.或者更好,避免使用xsl：for-each：
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" indent="yes"/>
<xsl:strip-space elements="*"/>
<xsl:template match="/root">
<xsl:apply-templates select="tag2[subtag1/@att='apple']"/>
</xsl:template>
<xsl:template match="tag2">
<apple>
<seq_num><xsl:value-of select="position()" /></seq_num>
<colour><xsl:value-of select="subtag2/subsubtag1" /></colour>
<meal><xsl:value-of select="subtag2/subsubtag2" /></meal>
</apple>
</xsl:template>
</xsl:stylesheet>
