XSLT&字符串操作查询 [英] XSLT & String manipulation query
问题描述
您好，
我正在尝试在我的样式表中执行一些字符串操作，并且
已经陷入了下面的问题，所以希望可以引出一些有用的
提示。
即问题是我需要在身份转换中将不合格的Xpath转换为
a完全限定的Xpath，即
/ AAA / BBB / CCC / @ DDD
转换为
/ ns ：AAA / ns：BBB / ns：CCC / @ DDD
带有预定义的NS前缀并使用字符串标记器（从
http://www.xslt.com/html/xsl-list/2005- 04 / msg00031.html ）返回
代币为：
< token> AAA< / token>
< token> BBB< / token>
< token> CCC< / token>
< token> @ DDD< / token>
我正在分配变量''令牌' '在下面的模板中，
然后尝试生成完全限定的命名空间：
< xsl：template name =" qualifiedXpath">
< xsl：param name =" unqualifiedXpath" />
<！ - - >
< xsl：变量名=" sampleUnqualifiedXpath"
select ="''/ AAA / BBB / CCC / @ DDD''" />
<！ - 硬编码名称空间前缀 - >
< xsl：variable name =" prefixString" select ="''dns：''" />
<！ - 硬编码分隔符 - >
< xsl：variable name = "斜线" select ="''/''" />
<！ - 包含令牌的变量 - >
< xsl：变量名=" tokens">
<！ - 调用令牌化器模板 - >
< xsl：call-template name =" tokenizer">
< xsl：with-param name =" string" select =" $ sampleUnqualifiedXpath" />
< xsl：with-param name =" delimiter" select =" $ slash" />
< / xsl：call-template>
< / xsl：variable>
< ;! - 变量以保存合格的Xpath - >
< xsl：variable name =" qualXpath">
<！ - 构建合格的Xpath - >
<！ - 迭代返回的令牌节点 - >
< xsl：for-each select =" $令牌/令牌">
<！ - 添加分隔符 - >
< xsl：value-of select =" $ slash" />
<！ - 只有当token是元素名称时才添加前缀，即没有
@字符 - >
< xsl：if test =" not（contains（。，''@''））">
<！ - 添加名称空间前缀 - >
< xsl：value-of select =" $ prefixString" />
<！ - 添加令牌的价值 - >
< xsl：value-of select ="。" />
< / xsl：if>
< / xsl：for-每个>
&l t; / xsl：variable>
<！ - 返回qualXpath变量 - >
< xsl：value-of select =" $ qualXpath" / >
< / xsl：template>
其中令牌在循环声明中的用法
< xsl ：for-each select =" $ tokens / token">
导致结果树片段（RTF）错误;我已经谷歌搜索了更多关于它的信息，但坦率地说不明白这个问题，并且不确定
是另一种解决方案，因此寻求智慧长老们！
:-)
BTW，上面的代码片段可能是错误的（希望不会太多），因为
我一直坚持这个RTF错误，因此无法继续。我怀疑
使用contains（。，''@''），
我打算检查令牌节点''@'的值'性格，是
有点可疑。 :)
非常感谢！
问候，
Bilal B.
***通过开发人员指南发送 http://www.developersdex.com ***
Hello,
I''m trying to perform some string manipulations in my stylesheet and
have gotten stuck on the issue below so hopefully can elicit some useful
hints.
Namely, the problem is that I need to convert an unqualified Xpath to
a fully qualified Xpath in an identity transform, i.e.
/AAA/BBB/CCC/@DDD
converted to
/ns:AAA/ns:BBB/ns:CCC/@DDD
with a predefined NS prefix and using a string tokenizer (adopted from
http://www.xslt.com/html/xsl-list/2005-04/msg00031.html) which returns
the tokens as:
<token>AAA</token>
<token>BBB</token>
<token>CCC</token>
<token>@DDD</token>
I''m assigning to the variable ''tokens'' in the following template, which
then tries to produce the fully qualified namespace:
<xsl:template name="qualifiedXpath">
<xsl:param name="unqualifiedXpath"/>
<!-- -->
<xsl:variable name="sampleUnqualifiedXpath"
select="''/AAA/BBB/CCC/@DDD''"/>
<!-- hardcoded namespace prefix -->
<xsl:variable name="prefixString" select="''dns:''"/>
<!-- hardcoded delimiter character -->
<xsl:variable name="slash" select="''/''"/>
<!-- Variable to contain the tokens -->
<xsl:variable name="tokens">
<!-- Calling tokenizer template-->
<xsl:call-template name="tokenizer">
<xsl:with-param name="string" select="$sampleUnqualifiedXpath"/>
<xsl:with-param name="delimiter" select="$slash"/>
</xsl:call-template>
</xsl:variable>
<!-- Variable to hold the qualified Xpath -->
<xsl:variable name="qualXpath">
<!-- Constructing the qualified Xpath-->
<!-- Iterate through the returned token nodes -->
<xsl:for-each select="$tokens/token">
<!-- Add delimiter-->
<xsl:value-of select="$slash"/>
<!-- Add prefix only when token is an element name i.e. doesn''t have the
@ character -->
<xsl:if test="not(contains(.,''@''))">
<!-- Adding namespace prefix -->
<xsl:value-of select="$prefixString"/>
<!-- Add token''s value -->
<xsl:value-of select="."/>
</xsl:if>
</xsl:for-each>
</xsl:variable>
<!-- returning qualXpath variable -->
<xsl:value-of select="$qualXpath"/>
</xsl:template>
where the tokens'' usage in the loop declaration
<xsl:for-each select="$tokens/token">
is causing a Result Tree Fragment (RTF) error; I''ve googled to find out
more about it but frankly don''t understand the problem, and unsure what
an alternative solution would be and hence seeking Wisdom of The Elders!
:-)
BTW, the code snippet above might be buggy (hopefully not too much) as
I''ve been stuck at this RTF error and hence unable to proceed. I suspect
the usage of contains(.,''@''),
where I intend to check the token node''s value for a ''@'' character, is
bit fishy. :)
Many thanks!
Regards,
Bilal B.
*** Sent via Developersdex http://www.developersdex.com ***
推荐答案
sampleUnqualifiedXpath" />
< xsl：with-param name =" ;定界符" select ="
sampleUnqualifiedXpath"/>
<xsl:with-param name="delimiter" select="
slash" />
< / xsl：call-template>
< / xsl：变量>
<！ - 用于保存合格Xpath的变量 - >
< xsl：variable name =" qualXpath">
<！ - 构建合格的Xpath - >
<！ - 迭代返回的令牌节点 - >
< xsl：for-each select ="
slash"/>
</xsl:call-template>
</xsl:variable>
<!-- Variable to hold the qualified Xpath -->
<xsl:variable name="qualXpath">
<!-- Constructing the qualified Xpath-->
<!-- Iterate through the returned token nodes -->
<xsl:for-each select="
tokens / token">
<！ - Add delimiter - >
< xsl：value-of select ="
tokens/token">
<!-- Add delimiter-->
<xsl:value-of select="
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