xml - 不匹配的子元素也出现在 XSL 模板下

Question

我有以下 XML 代码

<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="new_proto.xsl"?>
<Return>
 <SDSSJ type="form" />
 <JSFK type="form" />
 <KJFK type="form2" />
 <HJDHH type="form"> New Val </HJDHH>
 <NNDJB type="some"> 
    <DJSJJ type="form">
       THIS
    </DJSJJ>
    <KAKKK type="nope">
    DONT
    </KAKKK>
 Not
</NNDJB>
</Return>

我只想获取所有具有属性 type='form' 的节点的名称。所以我尝试了以下 XSL。

  1 <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
  2    <xsl:output method="html" omit-xml-declaration="yes" indent="no"/>
  3       <xsl:template match="//*[@type='form']">
  4       <xsl:value-of select="name()" />
  5       </xsl:template>
  6 </xsl:stylesheet>

但不是 SDSSJ JSFK HJDHH DJSJJ ，而是 SDSSJ JSFK HJDHH DJSJJ DONT Not 。为什么不符合模板的子元素仍然出现？我应该怎么做才能摆脱他们？

Answer 1

添加此模板:

<xsl:template match="text()"/>

例子:

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
    <xsl:output method="html" omit-xml-declaration="yes" indent="no"/>

    <xsl:template match="//*[@type='form']">
        <xsl:value-of select="name()"/>
    </xsl:template>

    <xsl:template match="text()"/>

</xsl:stylesheet>

---

默认情况下，文本被传递到输出。上面的模板将去除不匹配的文本。

这是 what the spec says关于默认的 XSLT 模板规则:

There is a built-in template rule to allow recursive processing to continue in the absence of a successful pattern match by an explicit template rule in the stylesheet. This template rule applies to both element nodes and the root node. The following shows the equivalent of the built-in template rule:

<xsl:template match="*|/">
    <xsl:apply-templates/> 
</xsl:template>

There is also a built-in template rule for each mode, which allows recursive processing to continue in the same mode in the absence of a successful pattern match by an explicit template rule in the stylesheet. This template rule applies to both element nodes and the root node. The following shows the equivalent of the built-in template rule for mode m.

<xsl:template match="*|/" mode="m">
    <xsl:apply-templates mode="m"/> 
</xsl:template>

There is also a built-in template rule for text and attribute nodes that copies text through:

<xsl:template match="text()|@*">
    <xsl:value-of select="."/> 
</xsl:template>

The built-in template rule for processing instructions and comments is to do nothing.

<xsl:template match="processing-instruction()|comment()"/>

The built-in template rule for namespace nodes is also to do nothing. There is no pattern that can match a namespace node; so, the built-in template rule is the only template rule that is applied for namespace nodes.

The built-in template rules are treated as if they were imported implicitly before the stylesheet and so have lower import precedence than all other template rules. Thus, the author can override a built-in template rule by including an explicit template rule.