XSLT 2.0灵活，具有相同URI的默认或不同的前缀命名空间(XSLT 2.0 flexible with default or different prefixed namespace of the same URI)

 我是XSLT的新手，并且在一些锅炉板命名空间处理上遇到了麻烦。 
 
 我有以下xslt，其目标是简单地重命名一个元素： 
 
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xpath-default-namespace="http://www.ACORD.org/standards/PC_Surety/ACORD1/xml/" >
    <xsl:strip-space elements="*" />

    <!-- element template that copies over elements -->
    <xsl:template match="*">
        <xsl:element name="{name()}">
            <xsl:apply-templates select="@* | node()"/>
        </xsl:element>
    </xsl:template>

    <!-- attribute template to copy attributes over -->
    <xsl:template match="@*">
        <xsl:copy>
            <xsl:attribute name="{name()}"><xsl:value-of select="."/></xsl:attribute>
        </xsl:copy>
    </xsl:template>

    <!-- "other" template to copy the rest of the nodes -->
    <xsl:template match="comment() | text() | processing-instruction()">
        <xsl:copy/>
    </xsl:template>

    <!-- Rename an element -->
    <xsl:template match="BOPPolicyQuoteInqRq/RqUID" >
        <xsl:element name="RqUUID">
            <xsl:apply-templates select="node()|@*"/>
        </xsl:element>
    </xsl:template>

</xsl:stylesheet>
 
 转换以下xml按预期工作： 
 
<ACORD xmlns="http://www.ACORD.org/standards/PC_Surety/ACORD1/xml/">
  <InsuranceSvcRq>
    <BOPPolicyQuoteInqRq>
      <RqUID>E2BA6308-62D5-43AC-B8C1-7616FDFE9C98</RqUID>    
    </BOPPolicyQuoteInqRq>
  </InsuranceSvcRq>
</ACORD>
 
 但是，这个语义上等效的xml失败： 
 
<bloat:ACORD xmlns:bloat="http://www.ACORD.org/standards/PC_Surety/ACORD1/xml/">
  <bloat:InsuranceSvcRq>
    <bloat:BOPPolicyQuoteInqRq>
      <bloat:RqUID>E2BA6308-62D5-43AC-B8C1-7616FDFE9C98</bloat:RqUID>    
    </bloat:BOPPolicyQuoteInqRq>
  </bloat:InsuranceSvcRq>
</bloat:ACORD>
 
 我收到的错误是： 
 
Caused by: net.sf.saxon.trans.XPathException: Undeclared prefix in element name: bloat
    at net.sf.saxon.expr.instruct.ComputedElement.getElementName(ComputedElement.java:429)
    at net.sf.saxon.expr.instruct.ElementCreator.processLeavingTail(ElementCreator.java:388)
    at net.sf.saxon.expr.instruct.ElementCreator.processLeavingTail(ElementCreator.java:371)
    at net.sf.saxon.expr.instruct.Template.applyLeavingTail(Template.java:239)
    at net.sf.saxon.trans.Mode.applyTemplates(Mode.java:1056)
    at net.sf.saxon.trans.TextOnlyCopyRuleSet.process(TextOnlyCopyRuleSet.java:65)
    at net.sf.saxon.trans.Mode.applyTemplates(Mode.java:1044)
    at net.sf.saxon.Controller.transformDocument(Controller.java:2088)
    at net.sf.saxon.Controller.transform(Controller.java:1911)
    at org.apache.camel.builder.xml.XsltBuilder.process(XsltBuilder.java:141)
    at org.apache.camel.impl.ProcessorEndpoint.onExchange(ProcessorEndpoint.java:103)
    at org.apache.camel.component.xslt.XsltEndpoint.onExchange(XsltEndpoint.java:121)
    at org.apache.camel.impl.ProcessorEndpoint$1.process(ProcessorEndpoint.java:71)
    at org.apache.camel.util.AsyncProcessorConverterHelper$ProcessorToAsyncProcessorBridge.process(AsyncProcessorConverterHelper.java:61)
    at org.apache.camel.processor.SendProcessor.process(SendProcessor.java:141)
    at org.apache.camel.processor.RedeliveryErrorHandler.process(RedeliveryErrorHandler.java:460)
    at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:190)
    at org.apache.camel.processor.Pipeline.process(Pipeline.java:121)
    at org.apache.camel.processor.Pipeline.process(Pipeline.java:83)
    at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:190)
    at org.apache.camel.component.direct.DirectProducer.process(DirectProducer.java:62)
    at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:190)
    at org.apache.camel.util.AsyncProcessorHelper.process(AsyncProcessorHelper.java:109)
    at org.apache.camel.processor.UnitOfWorkProducer.process(UnitOfWorkProducer.java:68)
    at org.apache.camel.impl.ProducerCache$2.doInProducer(ProducerCache.java:412)
    at org.apache.camel.impl.ProducerCache$2.doInProducer(ProducerCache.java:380)
    at org.apache.camel.impl.ProducerCache.doInProducer(ProducerCache.java:270)
    at org.apache.camel.impl.ProducerCache.sendExchange(ProducerCache.java:380)
    at org.apache.camel.impl.ProducerCache.send(ProducerCache.java:221)
    at org.apache.camel.impl.DefaultProducerTemplate.send(DefaultProducerTemplate.java:124)
    at org.apache.camel.impl.DefaultProducerTemplate.sendBody(DefaultProducerTemplate.java:137)
    ... 32 more
 
 即使这些xmls在语义上是等效的，只要涉及到xml规范，XSLT变换器就会挂起，因为一个声明了前缀而另一个没有声明（我还冒险说它会挂起，如果一个以'foo'为前缀，另一个以'bar'为前缀）。 
 
 我处于这样一个位置：我无法强制传递给我xml的客户端以某种方式声明特定的前缀或命名空间。 我也不能保证他们明天不会决定使用不同的前缀别名。 
 
 我对声明xpath-default-namespace属性的理解是它告诉xslt转换器整个文档将与哪个命名空间URI相关联，无论它是否被声明为默认前缀，别名为'bloat'的前缀，或者甚至是别名'rainbowunicorns'的前缀。 
 
 xpath-default-namespace的属性究竟是做什么的，我怎样才能编写一个灵活的XSLT，它可以优雅地处理任意数量的语义等效命名空间，而不管客户端决定什么样的命名空间声明？ 
 
 规范如果相关：Camel 2.16.2 Saxon-HE 9.5.1-8 
 
 更新后的转换适用于xmls（由Martin Honnen提供）： 
 
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xpath-default-namespace="http://www.ACORD.org/standards/PC_Surety/ACORD1/xml/" >
    <xsl:strip-space elements="*" />

    <!-- element template that copies over elements -->
    <xsl:template match="@* | node()">
        <xsl:copy>
            <xsl:apply-templates select="@* | node()" />
        </xsl:copy>
    </xsl:template>

    <!-- "other" template to copy the rest of the nodes -->
    <xsl:template match="comment() | processing-instruction()">
        <xsl:copy/>
    </xsl:template>

    <!-- Rename an element -->
    <xsl:template match="BOPPolicyQuoteInqRq/RqUID" >
        <xsl:element name="RqUUID" namespace="{namespace-uri()}">
            <xsl:apply-templates select="node()|@*"/>
        </xsl:element>
    </xsl:template>

</xsl:stylesheet>

I am new to XSLT and am stumbling on some boiler plate namespace handling.
 
I have the following xslt where the goal is to simply rename one element:
 
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xpath-default-namespace="http://www.ACORD.org/standards/PC_Surety/ACORD1/xml/" >
    <xsl:strip-space elements="*" />

    <!-- element template that copies over elements -->
    <xsl:template match="*">
        <xsl:element name="{name()}">
            <xsl:apply-templates select="@* | node()"/>
        </xsl:element>
    </xsl:template>

    <!-- attribute template to copy attributes over -->
    <xsl:template match="@*">
        <xsl:copy>
            <xsl:attribute name="{name()}"><xsl:value-of select="."/></xsl:attribute>
        </xsl:copy>
    </xsl:template>

    <!-- "other" template to copy the rest of the nodes -->
    <xsl:template match="comment() | text() | processing-instruction()">
        <xsl:copy/>
    </xsl:template>

    <!-- Rename an element -->
    <xsl:template match="BOPPolicyQuoteInqRq/RqUID" >
        <xsl:element name="RqUUID">
            <xsl:apply-templates select="node()|@*"/>
        </xsl:element>
    </xsl:template>

</xsl:stylesheet>
 
Transforming the following xml works as expected:
 
<ACORD xmlns="http://www.ACORD.org/standards/PC_Surety/ACORD1/xml/">
  <InsuranceSvcRq>
    <BOPPolicyQuoteInqRq>
      <RqUID>E2BA6308-62D5-43AC-B8C1-7616FDFE9C98</RqUID>    
    </BOPPolicyQuoteInqRq>
  </InsuranceSvcRq>
</ACORD>
 
However, this semantically equivalent xml fails:
 
<bloat:ACORD xmlns:bloat="http://www.ACORD.org/standards/PC_Surety/ACORD1/xml/">
  <bloat:InsuranceSvcRq>
    <bloat:BOPPolicyQuoteInqRq>
      <bloat:RqUID>E2BA6308-62D5-43AC-B8C1-7616FDFE9C98</bloat:RqUID>    
    </bloat:BOPPolicyQuoteInqRq>
  </bloat:InsuranceSvcRq>
</bloat:ACORD>
 
The error i receive is:
 
Caused by: net.sf.saxon.trans.XPathException: Undeclared prefix in element name: bloat
    at net.sf.saxon.expr.instruct.ComputedElement.getElementName(ComputedElement.java:429)
    at net.sf.saxon.expr.instruct.ElementCreator.processLeavingTail(ElementCreator.java:388)
    at net.sf.saxon.expr.instruct.ElementCreator.processLeavingTail(ElementCreator.java:371)
    at net.sf.saxon.expr.instruct.Template.applyLeavingTail(Template.java:239)
    at net.sf.saxon.trans.Mode.applyTemplates(Mode.java:1056)
    at net.sf.saxon.trans.TextOnlyCopyRuleSet.process(TextOnlyCopyRuleSet.java:65)
    at net.sf.saxon.trans.Mode.applyTemplates(Mode.java:1044)
    at net.sf.saxon.Controller.transformDocument(Controller.java:2088)
    at net.sf.saxon.Controller.transform(Controller.java:1911)
    at org.apache.camel.builder.xml.XsltBuilder.process(XsltBuilder.java:141)
    at org.apache.camel.impl.ProcessorEndpoint.onExchange(ProcessorEndpoint.java:103)
    at org.apache.camel.component.xslt.XsltEndpoint.onExchange(XsltEndpoint.java:121)
    at org.apache.camel.impl.ProcessorEndpoint$1.process(ProcessorEndpoint.java:71)
    at org.apache.camel.util.AsyncProcessorConverterHelper$ProcessorToAsyncProcessorBridge.process(AsyncProcessorConverterHelper.java:61)
    at org.apache.camel.processor.SendProcessor.process(SendProcessor.java:141)
    at org.apache.camel.processor.RedeliveryErrorHandler.process(RedeliveryErrorHandler.java:460)
    at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:190)
    at org.apache.camel.processor.Pipeline.process(Pipeline.java:121)
    at org.apache.camel.processor.Pipeline.process(Pipeline.java:83)
    at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:190)
    at org.apache.camel.component.direct.DirectProducer.process(DirectProducer.java:62)
    at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:190)
    at org.apache.camel.util.AsyncProcessorHelper.process(AsyncProcessorHelper.java:109)
    at org.apache.camel.processor.UnitOfWorkProducer.process(UnitOfWorkProducer.java:68)
    at org.apache.camel.impl.ProducerCache$2.doInProducer(ProducerCache.java:412)
    at org.apache.camel.impl.ProducerCache$2.doInProducer(ProducerCache.java:380)
    at org.apache.camel.impl.ProducerCache.doInProducer(ProducerCache.java:270)
    at org.apache.camel.impl.ProducerCache.sendExchange(ProducerCache.java:380)
    at org.apache.camel.impl.ProducerCache.send(ProducerCache.java:221)
    at org.apache.camel.impl.DefaultProducerTemplate.send(DefaultProducerTemplate.java:124)
    at org.apache.camel.impl.DefaultProducerTemplate.sendBody(DefaultProducerTemplate.java:137)
    ... 32 more
 
It appears even though these xmls are semantically equivalent as far as the xml spec would be concerned, the XSLT transformer is getting hung up because one declares a prefix and the other doesn't (i would also venture to say it will get hung up if one was prefixed with 'foo' and one with 'bar').
 
I am in a position where I can't force the client who's passing me xml to declare a specific prefix or namespace a certain way. I also can't guarantee they won't decide to utilize a different prefix alias tomorrow.
 
My understanding of declaring the xpath-default-namespace attribute was that it told the xslt transformer what namespace URI the entire document will be associated with regardless of whether it would be declared as a default prefix, a prefix with the alias 'bloat', or even a prefix with the alias 'rainbowunicorns'.
 
What precisely does the attribute xpath-default-namespace do and how can I can write a flexible XSLT that can gracefully handle any amount of semantically equivalent namespaces regardless of what flavor of namespace declaration the client decides?
 
Specs if relevant: Camel 2.16.2 Saxon-HE 9.5.1-8
 
Updated transform that works with both xmls (courtesy of Martin Honnen):
 
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xpath-default-namespace="http://www.ACORD.org/standards/PC_Surety/ACORD1/xml/" >
    <xsl:strip-space elements="*" />

    <!-- element template that copies over elements -->
    <xsl:template match="@* | node()">
        <xsl:copy>
            <xsl:apply-templates select="@* | node()" />
        </xsl:copy>
    </xsl:template>

    <!-- "other" template to copy the rest of the nodes -->
    <xsl:template match="comment() | processing-instruction()">
        <xsl:copy/>
    </xsl:template>

    <!-- Rename an element -->
    <xsl:template match="BOPPolicyQuoteInqRq/RqUID" >
        <xsl:element name="RqUUID" namespace="{namespace-uri()}">
            <xsl:apply-templates select="node()|@*"/>
        </xsl:element>
    </xsl:template>

</xsl:stylesheet>

原文：https://stackoverflow.com/questions/38997742