问题描述
我是 XSLT 的新手，有人可以建议我如何将来自 xml 的两个元素作为字符串进行比较，它们的值是:
--XML 代码<OU_ADDR1>第五大道90号</OU_ADDR1>--XML 代码<xsl:when test="OU_NAME='OU_ADDR1'">--比较来自 XML 的两个元素<!--remove if adrees 已经包含操作单元名称<xsl:value-of select="OU_NAME"/><fo:block/>--><xsl:if test="OU_ADDR1 !='' "><xsl:value-of select="OU_ADDR1"/><fo:block/></xsl:if><xsl:if test="LE_ADDR2 !='' "><xsl:value-of select="OU_ADDR2"/><fo:block/></xsl:if><xsl:if test="LE_ADDR3 !='' "><xsl:value-of select="OU_ADDR3"/><fo:block/></xsl:if><xsl:if test="OU_TOWN_CITY !=''"><xsl:value-of select="OU_TOWN_CITY"/>,<fo:leader leader-pattern="space" leader-length="2.0pt"/></xsl:if><xsl:value-of select="OU_REGION2"/><fo:leader leader-pattern="space" leader-length="3.0pt"/><xsl:value-of select="OU_POSTALCODE"/><fo:block/><xsl:value-of select="OU_COUNTRY"/></xsl:when><xsl:否则><xsl:value-of select="OU_NAME"/><fo:block/><xsl:if test="OU_ADDR1 !='' "><xsl:value-of select="OU_ADDR1"/><fo:block/></xsl:if><xsl:if test="LE_ADDR2 !='' "><xsl:value-of select="OU_ADDR2"/><fo:block/></xsl:if><xsl:if test="LE_ADDR3 !='' "><xsl:value-of select="OU_ADDR3"/><fo:block/></xsl:if><xsl:if test="OU_TOWN_CITY !=''"><xsl:value-of select="OU_TOWN_CITY"/>,<fo:leader leader-pattern="space" leader-length="2.0pt"/></xsl:if><xsl:value-of select="OU_REGION2"/><fo:leader leader-pattern="space" leader-length="3.0pt"/><xsl:value-of select="OU_POSTALCODE"/><fo:block/><xsl:value-of select="OU_COUNTRY"/></xsl:否则></xsl:选择>首先提供的长代码:
<xsl:when test="OU_NAME='OU_ADDR1'">--比较来自 XML 的两个元素<!--remove if adrees 已经包含操作单元名称 <xsl:value-of select="OU_NAME"/><fo:block/>--><xsl:if test="OU_ADDR1 !='' "><xsl:value-of select="OU_ADDR1"/><fo:block/></xsl:if><xsl:if test="LE_ADDR2 !='' "><xsl:value-of select="OU_ADDR2"/><fo:block/></xsl:if><xsl:if test="LE_ADDR3 !='' "><xsl:value-of select="OU_ADDR3"/><fo:block/></xsl:if><xsl:if test="OU_TOWN_CITY !=''"><xsl:value-of select="OU_TOWN_CITY"/>,<fo:leader leader-pattern="space" leader-length="2.0pt"/></xsl:if><xsl:value-of select="OU_REGION2"/><fo:leader leader-pattern="space" leader-length="3.0pt"/><xsl:value-of select="OU_POSTALCODE"/><fo:block/><xsl:value-of select="OU_COUNTRY"/></xsl:when><xsl:否则><xsl:value-of select="OU_NAME"/><fo:block/><xsl:if test="OU_ADDR1 !='' "><xsl:value-of select="OU_ADDR1"/><fo:block/></xsl:if><xsl:if test="LE_ADDR2 !='' "><xsl:value-of select="OU_ADDR2"/><fo:block/></xsl:if><xsl:if test="LE_ADDR3 !='' "><xsl:value-of select="OU_ADDR3"/><fo:block/></xsl:if><xsl:if test="OU_TOWN_CITY !=''"><xsl:value-of select="OU_TOWN_CITY"/>,<fo:leader leader-pattern="space" leader-length="2.0pt"/></xsl:if><xsl:value-of select="OU_REGION2"/><fo:leader leader-pattern="space" leader-length="3.0pt"/><xsl:value-of select="OU_POSTALCODE"/><fo:block/><xsl:value-of select="OU_COUNTRY"/></xsl:否则></xsl:选择>相当于这个，代码更短:
<xsl:value-of select="OU_NAME"/></xsl:if><xsl:if test="OU_ADDR1 !='' "><xsl:value-of select="OU_ADDR1"/><fo:block/></xsl:if><xsl:if test="LE_ADDR2 !='' "><xsl:value-of select="OU_ADDR2"/><fo:block/></xsl:if><xsl:if test="LE_ADDR3 !='' "><xsl:value-of select="OU_ADDR3"/><fo:block/></xsl:if><xsl:if test="OU_TOWN_CITY !=''"><xsl:value-of select="OU_TOWN_CITY"/>,<fo:leader leader-pattern="space" leader-length="2.0pt"/></xsl:if><xsl:value-of select="OU_REGION2"/><fo:leader leader-pattern="space" leader-length="3.0pt"/><xsl:value-of select="OU_POSTALCODE"/><fo:block/><xsl:value-of select="OU_COUNTRY"/>现在，回答您的问题:
如何比较两个即将到来的元素从 xml 作为字符串
在 Xpath 1.0 中，字符串只能比较相等(或不等)，使用运算符 = 和函数 not() 以及运算符 =.
$str1 = $str2在字符串 $str1 等于字符串 $str2 时准确地计算为 true().
not($str1 = $str2)在字符串 $str1 不等于字符串 $str2 时准确地计算为 true().
还有 != 运算符.通常应该避免它，因为只要它的一个操作数是节点集，它就会有异常行为.
现在，比较两个元素节点的规则是相似的:
$el1 = $el2在 $el1 的字符串值等于 $el2 的字符串值时，精确地计算为 true().
not($el1 = $el2)在 $el1 的字符串值不等于 $el2 的字符串值时，精确地计算为 true().>
然而，如果 = 的操作数之一是节点集，则
$ns = $str恰好在节点集 $ns1 中至少有一个节点，其字符串值等于字符串 $ 时，计算为 true()str
$ns1 = $ns2恰好在节点集 $ns1 中至少有一个节点，其字符串值等于某个节点的字符串值时，计算为 true()来自 $ns2
因此，表达式:
OU_NAME='OU_ADDR1'仅当当前节点至少有一个名为 OU_NAME 且其字符串值为字符串 'OU_ADDR1' 的子元素时，才计算为 true().
这显然不是你想要的！
很可能是您想要的:
OU_NAME=OU_ADDR1此表达式的计算结果为 true 正好有当前节点的至少一个 OU_NAME 子节点和当前节点的一个 OU_ADDR1 子节点相同的字符串值.
最后，在 XPath 2.0 中，还可以使用值比较运算符 lt、le、eq、gt、ge 和继承自 XPath 1.0 的通用比较运算符 =.
当一个或两个参数是一个以上项目的序列时，尝试对值比较运算符求值会导致错误.
i am new to XSLT ,can any one please suggest to me how to compare two elements coming from xml as string their values are:
<OU_NAME>Vision Operations</OU_NAME> --XML code
<OU_ADDR1>90 Fifth Avenue</OU_ADDR1> --XML code
<xsl:choose>
<xsl:when test="OU_NAME='OU_ADDR1'"> --comparing two elements coming from XML
<!--remove if adrees already contain operating unit name
<xsl:value-of select="OU_NAME"/> <fo:block/>-->
<xsl:if test="OU_ADDR1 !='' ">
<xsl:value-of select="OU_ADDR1"/>
<fo:block/>
</xsl:if>
<xsl:if test="LE_ADDR2 !='' ">
<xsl:value-of select="OU_ADDR2"/>
<fo:block/>
</xsl:if>
<xsl:if test="LE_ADDR3 !='' ">
<xsl:value-of select="OU_ADDR3"/>
<fo:block/>
</xsl:if>
<xsl:if test="OU_TOWN_CITY !=''">
<xsl:value-of select="OU_TOWN_CITY"/>,
<fo:leader leader-pattern="space" leader-length="2.0pt"/>
</xsl:if>
<xsl:value-of select="OU_REGION2"/>
<fo:leader leader-pattern="space" leader-length="3.0pt"/>
<xsl:value-of select="OU_POSTALCODE"/>
<fo:block/>
<xsl:value-of select="OU_COUNTRY"/>
</xsl:when>
<xsl:otherwise>
<xsl:value-of select="OU_NAME"/>
<fo:block/>
<xsl:if test="OU_ADDR1 !='' ">
<xsl:value-of select="OU_ADDR1"/>
<fo:block/>
</xsl:if>
<xsl:if test="LE_ADDR2 !='' ">
<xsl:value-of select="OU_ADDR2"/>
<fo:block/>
</xsl:if>
<xsl:if test="LE_ADDR3 !='' ">
<xsl:value-of select="OU_ADDR3"/>
<fo:block/>
</xsl:if>
<xsl:if test="OU_TOWN_CITY !=''">
<xsl:value-of select="OU_TOWN_CITY"/>,
<fo:leader leader-pattern="space" leader-length="2.0pt"/>
</xsl:if>
<xsl:value-of select="OU_REGION2"/>
<fo:leader leader-pattern="space" leader-length="3.0pt"/>
<xsl:value-of select="OU_POSTALCODE"/>
<fo:block/>
<xsl:value-of select="OU_COUNTRY"/>
</xsl:otherwise>
</xsl:choose>
First of all, the provided long code:
<xsl:choose>
<xsl:when test="OU_NAME='OU_ADDR1'"> --comparing two elements coming from XML
<!--remove if adrees already contain operating unit name <xsl:value-of select="OU_NAME"/> <fo:block/>-->
<xsl:if test="OU_ADDR1 !='' ">
<xsl:value-of select="OU_ADDR1"/>
<fo:block/>
</xsl:if>
<xsl:if test="LE_ADDR2 !='' ">
<xsl:value-of select="OU_ADDR2"/>
<fo:block/>
</xsl:if>
<xsl:if test="LE_ADDR3 !='' ">
<xsl:value-of select="OU_ADDR3"/>
<fo:block/>
</xsl:if>
<xsl:if test="OU_TOWN_CITY !=''">
<xsl:value-of select="OU_TOWN_CITY"/>,
<fo:leader leader-pattern="space" leader-length="2.0pt"/>
</xsl:if>
<xsl:value-of select="OU_REGION2"/>
<fo:leader leader-pattern="space" leader-length="3.0pt"/>
<xsl:value-of select="OU_POSTALCODE"/>
<fo:block/>
<xsl:value-of select="OU_COUNTRY"/>
</xsl:when>
<xsl:otherwise>
<xsl:value-of select="OU_NAME"/>
<fo:block/>
<xsl:if test="OU_ADDR1 !='' ">
<xsl:value-of select="OU_ADDR1"/>
<fo:block/>
</xsl:if>
<xsl:if test="LE_ADDR2 !='' ">
<xsl:value-of select="OU_ADDR2"/>
<fo:block/>
</xsl:if>
<xsl:if test="LE_ADDR3 !='' ">
<xsl:value-of select="OU_ADDR3"/>
<fo:block/>
</xsl:if>
<xsl:if test="OU_TOWN_CITY !=''">
<xsl:value-of select="OU_TOWN_CITY"/>,
<fo:leader leader-pattern="space" leader-length="2.0pt"/>
</xsl:if>
<xsl:value-of select="OU_REGION2"/>
<fo:leader leader-pattern="space" leader-length="3.0pt"/>
<xsl:value-of select="OU_POSTALCODE"/>
<fo:block/>
<xsl:value-of select="OU_COUNTRY"/>
</xsl:otherwise>
</xsl:choose>
is equivalent to this, much shorter code:
<xsl:if test="not(OU_NAME='OU_ADDR1)'">
<xsl:value-of select="OU_NAME"/>
</xsl:if>
<xsl:if test="OU_ADDR1 !='' ">
<xsl:value-of select="OU_ADDR1"/>
<fo:block/>
</xsl:if>
<xsl:if test="LE_ADDR2 !='' ">
<xsl:value-of select="OU_ADDR2"/>
<fo:block/>
</xsl:if>
<xsl:if test="LE_ADDR3 !='' ">
<xsl:value-of select="OU_ADDR3"/>
<fo:block/>
</xsl:if>
<xsl:if test="OU_TOWN_CITY !=''">
<xsl:value-of select="OU_TOWN_CITY"/>,
<fo:leader leader-pattern="space" leader-length="2.0pt"/>
</xsl:if>
<xsl:value-of select="OU_REGION2"/>
<fo:leader leader-pattern="space" leader-length="3.0pt"/>
<xsl:value-of select="OU_POSTALCODE"/>
<fo:block/>
<xsl:value-of select="OU_COUNTRY"/>
Now, to your question:
In Xpath 1.0 strings can be compared only for equality (or inequality), using the operator = and the function not() together with the operator =.
$str1 = $str2
evaluates to true() exactly when the string $str1 is equal to the string $str2.
not($str1 = $str2)
evaluates to true() exactly when the string $str1 is not equal to the string $str2.
There is also the != operator. It generally should be avoided because it has anomalous behavior whenever one of its operands is a node-set.
Now, the rules for comparing two element nodes are similar:
$el1 = $el2
evaluates to true() exactly when the string value of $el1 is equal to the string value of $el2.
not($el1 = $el2)
evaluates to true() exactly when the string value of $el1 is not equal to the string value of $el2.
However, if one of the operands of = is a node-set, then
$ns = $str
evaluates to true() exactly when there is at least one node in the node-set $ns1, whose string value is equal to the string $str
$ns1 = $ns2
evaluates to true() exactly when there is at least one node in the node-set $ns1, whose string value is equal to the string value of some node from $ns2
Therefore, the expression:
OU_NAME='OU_ADDR1'
evaluates to true() only when there is at least one element child of the current node that is named OU_NAME and whose string value is the string 'OU_ADDR1'.
This is obviously not what you want!
Most probably you want:
OU_NAME=OU_ADDR1
This expression evaluates to true exactly there is at least one OU_NAME child of the current node and one OU_ADDR1 child of the current node with the same string value.
Finally, in XPath 2.0, strings can be compared also using the value comparison operators lt, le, eq, gt, ge and the inherited from XPath 1.0 general comparison operator =.
Trying to evaluate a value comparison operator when one or both of its arguments is a sequence of more than one item results in error.
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