为什么 Jing 没有为 XInclude 选择 xml:id？
给定以下文件
a.rnc:
start = a
a = element a { b }
b = element b {
attribute xml:id { xsd:ID }?,
attribute xml:base { xsd:ID }?,
empty
}
a.xml:
<a xmlns:xi="http://www.w3.org/2001/XInclude">
<xi:include href="b.xml" xpointer="element(bid)"/>
</a>
b.xml:
<a><b xml:id="bid"/></a>
会报告
a.xml:1:97: warning: Include operation failed, reverting to fallback. Resource error reading file as XML (href='b.xml'). Reason: XPointer resolution unsuccessful.
a.xml:1:97: fatal: An 'include' failed, and no 'fallback' element was found.
为什么 Jing在运行时
java -Dorg.apache.xerces.xni.parser.XMLParserConfiguration=org.apache.xerces.parsers.XIncludeParserConfiguration -jar jing.jar -c a.rnc a.xml
？
如果我将 xpointer 属性更改为 element(/1/1) 它就会通过。
这是Jing的20091111，xercesImpl.jar与jing.jar在同一目录中。
Given the following files
a.rnc:
start = a
a = element a { b }
b = element b {
attribute xml:id { xsd:ID }?,
attribute xml:base { xsd:ID }?,
empty
}
a.xml:
<a xmlns:xi="http://www.w3.org/2001/XInclude">
<xi:include href="b.xml" xpointer="element(bid)"/>
</a>
b.xml:
<a><b xml:id="bid"/></a>
Why is Jing reporting
a.xml:1:97: warning: Include operation failed, reverting to fallback. Resource error reading file as XML (href='b.xml'). Reason: XPointer resolution unsuccessful.
a.xml:1:97: fatal: An 'include' failed, and no 'fallback' element was found.
when run as
java -Dorg.apache.xerces.xni.parser.XMLParserConfiguration=org.apache.xerces.parsers.XIncludeParserConfiguration -jar jing.jar -c a.rnc a.xml
?
If I change the xpointer attribute to element(/1/1) it passes.
This is with the 20091111 of Jing with xercesImpl.jar in the same directory as jing.jar.
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事实证明，Xerces 不支持 xml:id，从而使这成为可能。更详细的解释请参见rng-users 邮件列表 。
It turns out that Xerces doesn’t support xml:id in a way that makes this possible. A more detailed explanation is available on the rng-users mailing list.