Unable to get the XSLT select id() function to work successfully

问题

I'm having trouble getting the id() function to work in my xslt transformation per the example code below and I'm not sure why. When I load data.xml into a browser I'm expecting to see just the name & size values of the 'BC' item per the stylesheet/transformation. Any suggestions? FYI: I've adapted the example from another site.

File: transform.xslt

<?xml version="1.0" encoding="UTF-8"?>

<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">

<xsl:output method="html" indent="yes" encoding="UTF-8" />

<xsl:template match="/">
    <html>
        <body>      
            <xsl:value-of select="id('BC')/name" />
            <xsl:value-of select="id('BC')/size" />             
        </body>
    </html>
</xsl:template>

File: data.xml

<?xml version="1.0" encoding="UTF-8"?>

<?xml-stylesheet type="text/xsl" href="transform.xslt" ?>

<provinces xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="data.xsd">
 <province id="AB">
  <name>Alberta</name>
  <size>33</size>
 </province>
<province id="BC">
 <name>British Columbia</name>
 <size>44</size>
</province>
<province id="MB">
 <name>Manitoba</name>
 <size>55</size>
 </province>
</provinces>

File: data.xsd

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">

<xs:element name="provinces">   
    <xs:complexType>
        <xs:sequence>
            <xs:element ref="province" minOccurs="1" maxOccurs="unbounded" />
        </xs:sequence>
    </xs:complexType>       
</xs:element>

<xs:element name="province">
    <xs:complexType>
        <xs:sequence>
            <xs:element name="name"  />
            <xs:element name="size" />  
        </xs:sequence>
    <xs:attribute name="id" type="xs:ID" use="required"/>
    </xs:complexType>
</xs:element>       

 </xs:schema>

回答1:

Just because the attribute is named id doesn't make it an ID attribute: it has to be declared as an ID in the DTD or schema (or it can be named xml:id if the processor supports that).

It's probably simplest here to switch to using key() instead.

回答2:

As XSL 2.0 uses the same functions as XQuery 1.0 / XPath 2.0, you can also use the function fn:element-with-id. This function solves the problem that fn:id(...) only works with xml:id attributes (and not with xs:ID).

Read more about this here: How to use the XQuery fn:id() function?.

回答3:

Try

<xsl:value-of select="/id('BC')/name" />

instead of

<xsl:value-of select="id('BC')/name" />

来源：https://stackoverflow.com/questions/9264339/unable-to-get-the-xslt-select-id-function-to-work-successfully

标签

xml

xpath

xslt-2.0