com.icl.saxon.tree
Class DocumentImpl

java.lang.Object
  com.icl.saxon.om.AbstractNode
      com.icl.saxon.tree.NodeImpl
          com.icl.saxon.tree.ParentNodeImpl
              com.icl.saxon.tree.DocumentImpl

All Implemented Interfaces:

org.w3c.dom.Document, DocumentInfo, DOMLocator, org.w3c.dom.Node, NodeInfo, Source, SourceLocator

public final class DocumentImpl

extends com.icl.saxon.tree.ParentNodeImpl

implements DocumentInfo, org.w3c.dom.Document

A node in the XML parse tree representing the Document itself (or equivalently, the root node of the Document).

Field Summary

protected int

sequence

Fields inherited from class com.icl.saxon.tree.NodeImpl

emptyArray, parent

Fields inherited from class com.icl.saxon.om.AbstractNode

NODE_LETTER

Fields inherited from interface com.icl.saxon.om.NodeInfo

ATTRIBUTE, COMMENT, ELEMENT, NAMESPACE, NODE, NONE, NUMBER_OF_TYPES, PI, ROOT, TEXT

Fields inherited from interface org.w3c.dom.Node

ATTRIBUTE_NODE, CDATA_SECTION_NODE, COMMENT_NODE, DOCUMENT_FRAGMENT_NODE, DOCUMENT_NODE, DOCUMENT_TYPE_NODE, ELEMENT_NODE, ENTITY_NODE, ENTITY_REFERENCE_NODE, NOTATION_NODE, PROCESSING_INSTRUCTION_NODE, TEXT_NODE

Constructor Summary

DocumentImpl()

Method Summary

void	addChild(NodeImpl node, int index) Add a child node to this node.
org.w3c.dom.Node	adoptNode(org.w3c.dom.Node source) Attempts to adopt a node from another document to this document.
void	compact(int size) Compact the space used by this node
void	copy(Outputter out) Copy this node to a given outputter
void	copyStringValue(Outputter out) Copy the string-value of this node to a given outputter
void	dropChildren() Drop a branch of the tree.
AxisEnumeration	enumerateChildren(NodeTest test) Get an enumeration of the children of this node
java.lang.String	generateId() Get a character string that uniquely identifies this node within the document
protected AxisEnumeration	getAllElements(int fingerprint) Get a list of all elements with a given name fingerprint
java.lang.String	getBaseURI() Get the base URI of this root node.
java.lang.StringBuffer	getCharacterBuffer() Get the character buffer
org.w3c.dom.NodeList	getChildNodes() Return a NodeList that contains all children of this node.
org.w3c.dom.Element	getDocumentElement() Get the root (outermost) element.
DocumentInfo	getDocumentRoot() Get the root (document) node
java.lang.String	getDocumentURI() The location of the document or null if undefined or if the Document was created using DOMImplementation.createDocument.
org.w3c.dom.DOMConfiguration	getDomConfig() The configuration used when Document.normalizeDocument() is invoked.
org.w3c.dom.Node	getFirstChild() Get the first child node of the element
java.lang.String	getInputEncoding() An attribute specifying the encoding used for this document at the time of the parsing.
java.util.Hashtable	getKeyIndex(KeyManager keymanager, int fingerprint) Get the index for a given key
org.w3c.dom.Node	getLastChild() Get the last child node of the element
int	getLineNumber() Get the line number of this root node.
protected int	getLineNumber(int sequence) Get the line number for an element.
NamePool	getNamePool() Get the name pool used for the names in this document
org.w3c.dom.Node	getNextSibling() Get next sibling - always null
NodeFactory	getNodeFactory() Get the node factory that was used to build this document
short	getNodeType() Return the type of node.
java.lang.String	getNodeValue() Get the node value as defined in the DOM.
protected NodeImpl	getNthChild(int n) Get the nth child node of the element (numbering from 0)
org.w3c.dom.Node	getPreviousSibling() Get previous sibling - always null
protected long	getSequenceNumber() Get the node sequence number (in document order).
boolean	getStrictErrorChecking() An attribute specifying whether error checking is enforced or not.
java.lang.String	getStringValue() Return the string-value of the node, that is, the concatenation of the character content of all descendent elements and text nodes.
java.lang.String	getSystemId() Get the system id of this root node
protected java.lang.String	getSystemId(int seq) Get the system id of an element in the document
java.lang.String	getUnparsedEntity(java.lang.String name) Get the unparsed entity with a given name
java.lang.String	getXmlEncoding() An attribute specifying, as part of the XML declaration, the encoding of this document.
boolean	getXmlStandalone() An attribute specifying, as part of the XML declaration, whether this document is standalone.
java.lang.String	getXmlVersion() An attribute specifying, as part of the XML declaration, the version number of this document.
boolean	hasChildNodes() Determine if the node has any children.
void	normalizeDocument() This method acts as if the document was going through a save and load cycle, putting the document in a "normal" form.
void	removeChild(int index) Remove node at given index.
org.w3c.dom.Node	renameNode(org.w3c.dom.Node n, java.lang.String namespaceURI, java.lang.String qualifiedName) Rename an existing node of type ELEMENT_NODE or ATTRIBUTE_NODE.
void	renumberChildren() Renumber the children of a given parent node.
NodeInfo	selectID(java.lang.String id) Get the element with a given ID.
protected void	setCharacterBuffer(java.lang.StringBuffer buffer) Set the character buffer
protected void	setDocumentElement(ElementImpl e) Set the top-level element of the document (variously called the root element or the document element).
void	setDocumentURI(java.lang.String documentURI) The location of the document or null if undefined or if the Document was created using DOMImplementation.createDocument.
void	setKeyIndex(KeyManager keymanager, int fingerprint, java.util.Hashtable keyindex) Set the index for a given key.
protected void	setLineNumber(int sequence, int line) Set the line number for an element.
void	setLineNumbering() Set line numbering on
void	setNamePool(NamePool pool) Set the name pool used for all names in this document
void	setNodeFactory(NodeFactory factory) Set the node factory that was used to build this document
void	setStrictErrorChecking(boolean strictErrorChecking) An attribute specifying whether error checking is enforced or not.
protected void	setSystemId(int seq, java.lang.String uri) Set the system id of an element in the document
void	setSystemId(java.lang.String uri) Set the system id of this node
protected void	setUnparsedEntity(java.lang.String name, java.lang.String uri) Set an unparsed entity URI associated with this document.
void	setXmlStandalone(boolean xmlStandalone) An attribute specifying, as part of the XML declaration, whether this document is standalone.
void	setXmlVersion(java.lang.String xmlVersion) An attribute specifying, as part of the XML declaration, the version number of this document.
void	useChildrenArray(NodeImpl[] array) Supply an array to be used for the array of children.

Methods inherited from class com.icl.saxon.tree.NodeImpl

compareOrder, getAttributes, getAttributeValue, getAttributeValue, getDisplayName, getEnumeration, getFingerprint, getLocalName, getNameCode, getNextInDocument, getOriginatingNode, getParent, getPrefix, getPreviousInDocument, getURI, hasAttributes, isSameNodeInfo, outputNamespaceNodes, removeNode

Methods inherited from class com.icl.saxon.om.AbstractNode

appendChild, appendData, cloneNode, compareDocumentPosition, createAttribute, createAttributeNS, createCDATASection, createComment, createDocumentFragment, createElement, createElementNS, createEntityReference, createProcessingInstruction, createTextNode, deleteData, disallowUpdate, getAttribute, getAttributeNode, getAttributeNodeNS, getAttributeNS, getColumnNumber, getData, getDoctype, getElementById, getElementsByTagName, getElementsByTagNameNS, getFeature, getImplementation, getLength, getName, getNamespaceURI, getNodeName, getOwnerDocument, getOwnerElement, getParentNode, getPublicId, getSchemaTypeInfo, getSpecified, getTagName, getTextContent, getUserData, getValue, getWholeText, hasAttribute, hasAttributeNS, importNode, insertBefore, insertData, isDefaultNamespace, isElementContentWhitespace, isEqualNode, isId, isSameNode, isSupported, lookupNamespaceURI, lookupPrefix, normalize, removeAttribute, removeAttributeNode, removeAttributeNS, removeChild, replaceChild, replaceData, replaceWholeText, setAttributeNode, setAttributeNodeNS, setAttributeNS, setData, setIdAttribute, setIdAttributeNode, setIdAttributeNS, setNodeValue, setPrefix, setTextContent, setUserData, setValue, splitText, substringData, supports

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface com.icl.saxon.om.NodeInfo

compareOrder, copyStringValue, getAttributeValue, getAttributeValue, getDisplayName, getEnumeration, getFingerprint, getLocalName, getNameCode, getParent, getPrefix, getStringValue, getURI, hasChildNodes, isSameNodeInfo, outputNamespaceNodes

Methods inherited from interface org.w3c.dom.Document

createAttribute, createAttributeNS, createCDATASection, createComment, createDocumentFragment, createElement, createElementNS, createEntityReference, createProcessingInstruction, createTextNode, getDoctype, getElementById, getElementsByTagName, getElementsByTagNameNS, getImplementation, importNode

Methods inherited from interface org.w3c.dom.Node

appendChild, cloneNode, getAttributes, getChildNodes, getFirstChild, getLastChild, getLocalName, getNamespaceURI, getNodeName, getNodeValue, getOwnerDocument, getParentNode, getPrefix, hasAttributes, hasChildNodes, insertBefore, isSupported, normalize, removeChild, replaceChild, setNodeValue, setPrefix

Field Detail

sequence

protected int sequence

Constructor Detail

DocumentImpl

public DocumentImpl()

Method Detail

setCharacterBuffer

protected void setCharacterBuffer(java.lang.StringBuffer buffer)

Set the character buffer

getCharacterBuffer

public final java.lang.StringBuffer getCharacterBuffer()

Get the character buffer

setNamePool

public void setNamePool(NamePool pool)

Set the name pool used for all names in this document

Specified by:

setNamePool in interface DocumentInfo

getNamePool

public NamePool getNamePool()

Get the name pool used for the names in this document

Specified by:

getNamePool in interface DocumentInfo

Overrides:

getNamePool in class NodeImpl

setNodeFactory

public void setNodeFactory(NodeFactory factory)

Set the node factory that was used to build this document

getNodeFactory

public NodeFactory getNodeFactory()

Get the node factory that was used to build this document

setDocumentElement

protected void setDocumentElement(ElementImpl e)

Set the top-level element of the document (variously called the root element or the document element). Note that a DocumentImpl may represent the root of a result tree fragment, in which case there is no document element.

Parameters:

e - the top-level element

setSystemId

public void setSystemId(java.lang.String uri)

Set the system id of this node

Specified by:

setSystemId in interface Source

Overrides:

setSystemId in class NodeImpl

getSystemId

public java.lang.String getSystemId()

Get the system id of this root node

Specified by:

getSystemId in interface NodeInfo

Overrides:

getSystemId in class NodeImpl

getBaseURI

public java.lang.String getBaseURI()

Get the base URI of this root node. For a root node the base URI is the same as the System ID.

Specified by:

getBaseURI in interface NodeInfo

Overrides:

getBaseURI in class NodeImpl

setSystemId

protected void setSystemId(int seq,
                           java.lang.String uri)

Set the system id of an element in the document

getSystemId

protected java.lang.String getSystemId(int seq)

Get the system id of an element in the document

setLineNumbering

public void setLineNumbering()

Set line numbering on

setLineNumber

protected void setLineNumber(int sequence,
                             int line)

Set the line number for an element. Ignored if line numbering is off.

getLineNumber

protected int getLineNumber(int sequence)

Get the line number for an element. Return -1 if line numbering is off.

getLineNumber

public int getLineNumber()

Get the line number of this root node.

Specified by:

getLineNumber in interface NodeInfo

Overrides:

getLineNumber in class NodeImpl

Returns:

0 always

getNodeType

public final short getNodeType()

Return the type of node.

Specified by:

getNodeType in interface NodeInfo

Returns:

NodeInfo.ROOT (always)

getNextSibling

public final org.w3c.dom.Node getNextSibling()

Get next sibling - always null

Specified by:

getNextSibling in interface org.w3c.dom.Node

Overrides:

getNextSibling in class NodeImpl

Returns:

null

getPreviousSibling

public final org.w3c.dom.Node getPreviousSibling()

Get previous sibling - always null

Specified by:

getPreviousSibling in interface org.w3c.dom.Node

Overrides:

getPreviousSibling in class NodeImpl

Returns:

null

getDocumentElement

public org.w3c.dom.Element getDocumentElement()

Get the root (outermost) element.

Specified by:

getDocumentElement in interface org.w3c.dom.Document

Overrides:

getDocumentElement in class NodeImpl

Returns:

the Element node for the outermost element of the document.

getDocumentRoot

public DocumentInfo getDocumentRoot()

Get the root (document) node

Specified by:

getDocumentRoot in interface NodeInfo

Overrides:

getDocumentRoot in class NodeImpl

Returns:

the DocumentInfo representing this document

generateId

public java.lang.String generateId()

Get a character string that uniquely identifies this node within the document

Specified by:

generateId in interface NodeInfo

Overrides:

generateId in class NodeImpl

Returns:

the empty string

getAllElements

protected AxisEnumeration getAllElements(int fingerprint)

Get a list of all elements with a given name fingerprint

selectID

public NodeInfo selectID(java.lang.String id)

Get the element with a given ID.

Specified by:

selectID in interface DocumentInfo

Parameters:

id - The unique ID of the required element, previously registered using registerID()

Returns:

The NodeInfo for the given ID if one has been registered, otherwise null.

getKeyIndex

public java.util.Hashtable getKeyIndex(KeyManager keymanager,
                                       int fingerprint)

Get the index for a given key

Specified by:

getKeyIndex in interface DocumentInfo

Parameters:

keymanager - The key manager managing this key

fingerprint - The fingerprint of the name of the key (unique with the key manager)

Returns:

The index, if one has been built, in the form of a Hashtable that maps the key value to a Vector of nodes having that key value. If no index has been built, returns null.

setKeyIndex

public void setKeyIndex(KeyManager keymanager,
                        int fingerprint,
                        java.util.Hashtable keyindex)

Set the index for a given key. The method is synchronized because the same document can be used by several stylesheets at the same time.

Specified by:

setKeyIndex in interface DocumentInfo

Parameters:

keymanager - The key manager managing this key

fingerprint - The fingerprint of the name of the key (unique with the key manager)

keyindex - the index, in the form of a Hashtable that maps the key value to a Vector of nodes having that key value. Or the String "under construction", indicating that the index is being built.

setUnparsedEntity

protected void setUnparsedEntity(java.lang.String name,
                                 java.lang.String uri)

Set an unparsed entity URI associated with this document. For system use only, while building the document.

getUnparsedEntity

public java.lang.String getUnparsedEntity(java.lang.String name)

Get the unparsed entity with a given name

Specified by:

getUnparsedEntity in interface DocumentInfo

Parameters:

name - the name of the entity

Returns:

the URI of the entity if there is one, or empty string if not

copy

public void copy(Outputter out)
          throws TransformerException

Copy this node to a given outputter

Specified by:

copy in interface NodeInfo

Throws:

TransformerException

adoptNode

public org.w3c.dom.Node adoptNode(org.w3c.dom.Node source)
                           throws org.w3c.dom.DOMException

Attempts to adopt a node from another document to this document.

Parameters:

source - The node to move into this document.

Returns:

The adopted node, or null if this operation fails, such as when the source node comes from a different implementation.

Throws:

org.w3c.dom.DOMException - NOT_SUPPORTED_ERR: Raised if the source node is of type DOCUMENT, DOCUMENT_TYPE.
NO_MODIFICATION_ALLOWED_ERR: Raised when the source node is readonly.

Since:

DOM Level 3

getDocumentURI

public java.lang.String getDocumentURI()

The location of the document or null if undefined or if the Document was created using DOMImplementation.createDocument. No lexical checking is performed when setting this attribute; this could result in a null value returned when using Node.baseURI .
Beware that when the Document supports the feature "HTML" [DOM Level 2 HTML] , the href attribute of the HTML BASE element takes precedence over this attribute when computing Node.baseURI.

Since:

DOM Level 3

getDomConfig

public org.w3c.dom.DOMConfiguration getDomConfig()

The configuration used when Document.normalizeDocument() is invoked.

Since:

DOM Level 3

getInputEncoding

public java.lang.String getInputEncoding()

An attribute specifying the encoding used for this document at the time of the parsing. This is null when it is not known, such as when the Document was created in memory.

Since:

DOM Level 3

getStrictErrorChecking

public boolean getStrictErrorChecking()

An attribute specifying whether error checking is enforced or not. When set to false, the implementation is free to not test every possible error case normally defined on DOM operations, and not raise any DOMException on DOM operations or report errors while using Document.normalizeDocument(). In case of error, the behavior is undefined. This attribute is true by default.

Since:

DOM Level 3

getXmlEncoding

public java.lang.String getXmlEncoding()

An attribute specifying, as part of the XML declaration, the encoding of this document. This is null when unspecified or when it is not known, such as when the Document was created in memory.

Since:

DOM Level 3

getXmlStandalone

public boolean getXmlStandalone()

An attribute specifying, as part of the XML declaration, whether this document is standalone. This is false when unspecified.

Note: No verification is done on the value when setting this attribute. Applications should use Document.normalizeDocument() with the "validate" parameter to verify if the value matches the validity constraint for standalone document declaration as defined in [XML 1.0].

Since:

DOM Level 3

getXmlVersion

public java.lang.String getXmlVersion()

An attribute specifying, as part of the XML declaration, the version number of this document. If there is no declaration and if this document supports the "XML" feature, the value is "1.0".

Since:

DOM Level 3

normalizeDocument

public void normalizeDocument()

This method acts as if the document was going through a save and load cycle, putting the document in a "normal" form.

Since:

DOM Level 3

renameNode

public org.w3c.dom.Node renameNode(org.w3c.dom.Node n,
                                   java.lang.String namespaceURI,
                                   java.lang.String qualifiedName)
                            throws org.w3c.dom.DOMException

Rename an existing node of type ELEMENT_NODE or ATTRIBUTE_NODE.

Parameters:

n - The node to rename.

namespaceURI - The new namespace URI.

qualifiedName - The new qualified name.

Returns:

The renamed node. This is either the specified node or the new node that was created to replace the specified node.

Throws:

org.w3c.dom.DOMException - NOT_SUPPORTED_ERR: Raised when the type of the specified node is neither ELEMENT_NODE nor ATTRIBUTE_NODE, or if the implementation does not support the renaming of the document element.
INVALID_CHARACTER_ERR: Raised if the new qualified name is not an XML name according to the XML version in use specified in the Document.xmlVersion attribute.
WRONG_DOCUMENT_ERR: Raised when the specified node was created from a different document than this document.
NAMESPACE_ERR: Raised if the qualifiedName is a malformed qualified name, if the qualifiedName has a prefix and the namespaceURI is null, or if the qualifiedName has a prefix that is "xml" and the namespaceURI is different from " http://www.w3.org/XML/1998/namespace" [XML Namespaces] . Also raised, when the node being renamed is an attribute, if the qualifiedName, or its prefix, is "xmlns" and the namespaceURI is different from "http://www.w3.org/2000/xmlns/".

Since:

DOM Level 3

setDocumentURI

public void setDocumentURI(java.lang.String documentURI)

The location of the document or null if undefined or if the Document was created using DOMImplementation.createDocument. No lexical checking is performed when setting this attribute; this could result in a null value returned when using Node.baseURI .
Beware that when the Document supports the feature "HTML" [DOM Level 2 HTML] , the href attribute of the HTML BASE element takes precedence over this attribute when computing Node.baseURI.

Since:

DOM Level 3

setStrictErrorChecking

public void setStrictErrorChecking(boolean strictErrorChecking)

An attribute specifying whether error checking is enforced or not. When set to false, the implementation is free to not test every possible error case normally defined on DOM operations, and not raise any DOMException on DOM operations or report errors while using Document.normalizeDocument(). In case of error, the behavior is undefined. This attribute is true by default.

Since:

DOM Level 3

setXmlStandalone

public void setXmlStandalone(boolean xmlStandalone)
                      throws org.w3c.dom.DOMException

An attribute specifying, as part of the XML declaration, whether this document is standalone. This is false when unspecified.

Note: No verification is done on the value when setting this attribute. Applications should use Document.normalizeDocument() with the "validate" parameter to verify if the value matches the validity constraint for standalone document declaration as defined in [XML 1.0].

Throws:

org.w3c.dom.DOMException - NOT_SUPPORTED_ERR: Raised if this document does not support the "XML" feature.

Since:

DOM Level 3

setXmlVersion

public void setXmlVersion(java.lang.String xmlVersion)
                   throws org.w3c.dom.DOMException

An attribute specifying, as part of the XML declaration, the version number of this document. If there is no declaration and if this document supports the "XML" feature, the value is "1.0". If this document does not support the "XML" feature, the value is always null. Changing this attribute will affect methods that check for invalid characters in XML names. Application should invoke Document.normalizeDocument() in order to check for invalid characters in the Nodes that are already part of this Document.
DOM applications may use the DOMImplementation.hasFeature(feature, version) method with parameter values "XMLVersion" and "1.0" (respectively) to determine if an implementation supports [XML 1.0]. DOM applications may use the same method with parameter values "XMLVersion" and "1.1" (respectively) to determine if an implementation supports [XML 1.1]. In both cases, in order to support XML, an implementation must also support the "XML" feature defined in this specification. Document objects supporting a version of the "XMLVersion" feature must not raise a NOT_SUPPORTED_ERR exception for the same version number when using Document.xmlVersion.

Throws:

org.w3c.dom.DOMException - NOT_SUPPORTED_ERR: Raised if the version is set to a value that is not supported by this Document or if this document does not support the "XML" feature.

Since:

DOM Level 3

getSequenceNumber

protected final long getSequenceNumber()

Get the node sequence number (in document order). Sequence numbers are monotonic but not consecutive. In the current implementation, parent nodes (elements and roots) have a zero least-significant word, while namespaces, attributes, text nodes, comments, and PIs have the top word the same as their owner and the bottom half reflecting their relative position.

Overrides:

getSequenceNumber in class NodeImpl

hasChildNodes

public final boolean hasChildNodes()

Determine if the node has any children.

Specified by:

hasChildNodes in interface org.w3c.dom.Node

Overrides:

hasChildNodes in class NodeImpl

Returns:

true if the node has any children, false if the node has no children.

enumerateChildren

public final AxisEnumeration enumerateChildren(NodeTest test)

Get an enumeration of the children of this node

getFirstChild

public final org.w3c.dom.Node getFirstChild()

Get the first child node of the element

Specified by:

getFirstChild in interface org.w3c.dom.Node

Overrides:

getFirstChild in class NodeImpl

Returns:

the first child node of the required type, or null if there are no children

getLastChild

public final org.w3c.dom.Node getLastChild()

Get the last child node of the element

Specified by:

getLastChild in interface org.w3c.dom.Node

Overrides:

getLastChild in class NodeImpl

Returns:

the last child of the element, or null if there are no children

getChildNodes

public final org.w3c.dom.NodeList getChildNodes()

Return a NodeList that contains all children of this node. If there are no children, this is a NodeList containing no nodes.

Specified by:

getChildNodes in interface org.w3c.dom.Node

Overrides:

getChildNodes in class NodeImpl

getNthChild

protected final NodeImpl getNthChild(int n)

Get the nth child node of the element (numbering from 0)

Returns:

the last child of the element, or null if there is no n'th child

getStringValue

public java.lang.String getStringValue()

Return the string-value of the node, that is, the concatenation of the character content of all descendent elements and text nodes.

Returns:

the accumulated character content of the element, including descendant elements.

copyStringValue

public void copyStringValue(Outputter out)
                     throws TransformerException

Copy the string-value of this node to a given outputter

Specified by:

copyStringValue in interface NodeInfo

Overrides:

copyStringValue in class AbstractNode

Throws:

TransformerException

useChildrenArray

public void useChildrenArray(NodeImpl[] array)

Supply an array to be used for the array of children. For system use only.

addChild

public void addChild(NodeImpl node,
                     int index)

Add a child node to this node. For system use only. Note: normalizing adjacent text nodes is the responsibility of the caller.

removeChild

public void removeChild(int index)

Remove node at given index. Will always be followed by a renumberChildren().

renumberChildren

public void renumberChildren()

Renumber the children of a given parent node. For system use only

dropChildren

public void dropChildren()

Drop a branch of the tree. The target element remains in the tree, but its children are disconnected from the parent. Unless there are other references to the children (e.g. in a variable) they will be deleted from memory next time the garbage collector comes round.

compact

public void compact(int size)

Compact the space used by this node

getNodeValue

public java.lang.String getNodeValue()

Get the node value as defined in the DOM. This is not the same as the XPath string-value.

Specified by:

getNodeValue in interface org.w3c.dom.Node

Overrides:

getNodeValue in class AbstractNode