Class NamespaceDifferencer
NamespaceDifferencer
is a ProxyReceiver
responsible for removing duplicate namespace
declarations. It also ensures that namespace undeclarations are emitted when necessary.
The NamespaceDifferencer assumes that in the input event stream, all in-scope namespaces for every element are accounted for in the call on namespace(). In the output event stream, the namespace() call represents namespace declarations rather than in-scope namespaces. So (a) redundant namespaces are removed, and (b) namespace undeclarations are added where necessary. A namespace undeclaration for the default namespace is always added if the parent element has a default namespace and the child element does not; namespace undeclarations for other namespaces are emitted only when the serialization option undeclare-namespaces is set.
The NamespaceDifferencer
is part of the serialization pipeline, responsible for translating result trees
to serialized XML. As such, it is not concerned with operations such as namespace fixup and namespace
inheritance that are part of the result tree construction process.
The NamespaceDifferencer
is also needed when writing output to tree models such as DOM and JDOM
that require local namespace declarations to be provided for each element node.
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Field Summary
Fields inherited from class net.sf.saxon.event.ProxyReceiver
nextReceiver
Fields inherited from class net.sf.saxon.event.SequenceReceiver
pipelineConfiguration, previousAtomic, systemId
Fields inherited from interface javax.xml.transform.Result
PI_DISABLE_OUTPUT_ESCAPING, PI_ENABLE_OUTPUT_ESCAPING
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Constructor Summary
ConstructorsConstructorDescriptionNamespaceDifferencer
(Receiver next) Create a NamespaceDifferencerNamespaceDifferencer
(Receiver next, Properties details) Create a NamespaceDifferencer -
Method Summary
Modifier and TypeMethodDescriptionvoid
End of elementvoid
startElement
(NodeName elemName, SchemaType type, AttributeMap attributes, NamespaceMap namespaces, Location location, int properties) startElement.Methods inherited from class net.sf.saxon.event.ProxyReceiver
append, characters, close, comment, endDocument, getNamePool, getNextReceiver, open, processingInstruction, setPipelineConfiguration, setSystemId, setUnderlyingReceiver, setUnparsedEntity, startDocument, usesTypeAnnotations
Methods inherited from class net.sf.saxon.event.SequenceReceiver
append, decompose, flatten, getConfiguration, getErrorCodeForDecomposingFunctionItems, getPipelineConfiguration, getSystemId, handlesAppend
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Constructor Details
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NamespaceDifferencer
Create a NamespaceDifferencer- Parameters:
next
- the Receiver to which events will be passed after namespace reduction
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NamespaceDifferencer
Create a NamespaceDifferencer- Parameters:
next
- the Receiver to which events will be passed after namespace reduction
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Method Details
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startElement
public void startElement(NodeName elemName, SchemaType type, AttributeMap attributes, NamespaceMap namespaces, Location location, int properties) throws XPathException startElement. This call removes redundant namespace declarations, and possibly adds an xmlns="" undeclaration.- Specified by:
startElement
in interfaceReceiver
- Overrides:
startElement
in classProxyReceiver
- Parameters:
elemName
- the name of the element.type
- the type annotation of the element.attributes
- the attributes of this elementnamespaces
- the in-scope namespaces of this element: generally this is all the in-scope namespaces, without relying on inheriting namespaces from parent elementslocation
- an object providing information about the module, line, and column where the node originatedproperties
- bit-significant properties of the element node. If there are no relevant properties, zero is supplied. The definitions of the bits are in classReceiverOption
- Throws:
XPathException
- if an error occurs
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endElement
Description copied from class:ProxyReceiver
End of element- Specified by:
endElement
in interfaceReceiver
- Overrides:
endElement
in classProxyReceiver
- Throws:
XPathException
- if an error occurs
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