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## org.dom4j
Interface Element

All Superinterfaces:
  Branch, Cloneable, Node

All Known Implementing Classes:
  AbstractElement

public interface Element
extends Branch

`Element` interface defines an XML element. An element can have declared namespaces, attributes, child nodes and textual content.

Some of this interface is optional. Some implementations may be read-only and not support being modified. Some implementations may not support the parent relationship and methods such as `Node.getParent()`or .

Version:
  $Revision: 1.47 $
Author:
  James Strachan

Field Summary

Fields inherited from interface org.dom4j.Node
`ANY_NODE, ATTRIBUTE_NODE, CDATA_SECTION_NODE, COMMENT_NODE, DOCUMENT_NODE, DOCUMENT_TYPE_NODE, ELEMENT_NODE, ENTITY_REFERENCE_NODE, MAX_NODE_TYPE, NAMESPACE_NODE, PROCESSING_INSTRUCTION_NODE, TEXT_NODE, UNKNOWN_NODE`

Method Summary
`void` | `add(Attribute attribute)` Adds the given `Attribute` to this element.
`void` | `add(CDATA cdata)` Adds the given `CDATA` to this element.
`void` | `add(Entity entity)` Adds the given `Entity` to this element.
`void` | `add(Namespace namespace)` Adds the given `Namespace` to this element.
`void` | `add(Text text)` Adds the given `Text` to this element.
`Element` | `addAttribute(QName qName, String value)` Adds the attribute value of the given fully qualified name.
`Element` | `addAttribute(String name, String value)` Adds the attribute value of the given local name.
`Element` | `addCDATA(String cdata)` Adds a new `CDATA` node with the given text to this element.
`Element` | `addComment(String comment)` Adds a new `Comment` node with the given text to this element.
`Element` | `addEntity(String name, String text)` Adds a new `Entity` node with the given name and text to this element and returns a reference to the new node.
`List` | `additionalNamespaces()` Returns any additional namespaces declarations for this element other than namespace returned via the `getNamespace()`method.
`Element` | `addNamespace(String prefix, String uri)` Adds a namespace to this element for use by its child content
`Element` | `addProcessingInstruction(String target, Map data)` Adds a processing instruction for the given target
`Element` | `addProcessingInstruction(String target, String text)` Adds a processing instruction for the given target
`Element` | `addText(String text)` Adds a new `Text` node with the given text to this element.
`void` | `appendAttributes(Element element)` Appends the attributes of the given element to me.
`Attribute` | `attribute(int index)` Returns the attribute at the specified indexGets the
`Attribute` | `attribute(QName qName)` DOCUMENT ME!
`Attribute` | `attribute(String name)` Returns the attribute with the given name
`int` | `attributeCount()` DOCUMENT ME!
`Iterator` | `attributeIterator()` DOCUMENT ME!
`List` | `attributes()` Returns the `Attribute`instances this element contains as a backed `List`so that the attributes may be modified directly using the `List`interface.
`String` | `attributeValue(QName qName)` This returns the attribute value for the attribute with the given fully qualified name or null if there is no such attribute or the empty string if the attribute value is empty.
`String` | `attributeValue(QName qName, String defaultValue)` This returns the attribute value for the attribute with the given fully qualified name or the default value if there is no such attribute value.
`String` | `attributeValue(String name)` This returns the attribute value for the attribute with the given name and any namespace or null if there is no such attribute or the empty string if the attribute value is empty.
`String` | `attributeValue(String name, String defaultValue)` This returns the attribute value for the attribute with the given name and any namespace or the default value if there is no such attribute value.
`Element` | `createCopy()` Creates a deep copy of this element The new element is detached from its parent, and getParent() on the clone will return null.
`Element` | `createCopy(QName qName)` Creates a deep copy of this element with the given fully qualified name.
`Element` | `createCopy(String name)` Creates a deep copy of this element with the given local name The new element is detached from its parent, and getParent() on the clone will return null.
`List` | `declaredNamespaces()` Returns all the namespaces declared by this element.
`Element` | `element(QName qName)` Returns the first element for the given fully qualified name.
`Element` | `element(String name)` Returns the first element for the given local name and any namespace.
`Iterator` | `elementIterator()` Returns an iterator over all this elements child elements.
`Iterator` | `elementIterator(QName qName)` Returns an iterator over the elements contained in this element which match the given fully qualified name.
`Iterator` | `elementIterator(String name)` Returns an iterator over the elements contained in this element which match the given local name and any namespace.
`List` | `elements()` Returns the elements contained in this element.
`List` | `elements(QName qName)` Returns the elements contained in this element with the given fully qualified name.
`List` | `elements(String name)` Returns the elements contained in this element with the given local name and any namespace.
`String` | `elementText(QName qname)`
`String` | `elementText(String name)`
`String` | `elementTextTrim(QName qname)`
`String` | `elementTextTrim(String name)`
`Object` | `getData()` Accesses the data of this element which may implement data typing bindings such as XML Schema or Java Bean bindings or will return the same value as `getText()`
`Namespace` | `getNamespace()` Returns the `Namespace` of this element if one exists otherwise `Namespace.NO_NAMESPACE` is returned.
`Namespace` | `getNamespaceForPrefix(String prefix)` Returns the `Namespace` which is mapped to the given prefix or null if it could not be found.
`Namespace` | `getNamespaceForURI(String uri)` Returns the `Namespace` which is mapped to the given URI or null if it could not be found.
`String` | `getNamespacePrefix()` Returns the namespace prefix of this element if one exists otherwise an empty `String` is returned.
`List` | `getNamespacesForURI(String uri)` Returns the all namespaces which are mapped to the given URI or an empty list if no such namespaces could be found.
`String` | `getNamespaceURI()` Returns the URI mapped to the namespace of this element if one exists otherwise an empty `String` is returned.
`QName` | `getQName()` Returns the `QName` of this element which represents the local name, the qualified name and the `Namespace`.
`QName` | `getQName(String qualifiedName)` Returns the `QName` for the given qualified name, using the namespace URI in scope for the given prefix of the qualified name or the default namespace if the qualified name has no prefix.
`String` | `getQualifiedName()` Returns the fully qualified name of this element.
`String` | `getStringValue()` Returns the XPath string-value of this node.
`String` | `getText()` Returns the text value of this element without recursing through child elements.
`String` | `getTextTrim()` DOCUMENT ME!
`Node` | `getXPathResult(int index)` Returns a node at the given index suitable for an XPath result set.
`boolean` | `hasMixedContent()` Returns true if this `Element` has mixed content.
`boolean` | `isRootElement()` DOCUMENT ME!
`boolean` | `isTextOnly()` Returns true if this `Element` has text only content.
`boolean` | `remove(Attribute attribute)` Removes the given `Attribute` from this element.
`boolean` | `remove(CDATA cdata)` Removes the given `CDATA` if the node is an immediate child of this element.
`boolean` | `remove(Entity entity)` Removes the given `Entity` if the node is an immediate child of this element.
`boolean` | `remove(Namespace namespace)` Removes the given `Namespace` if the node is an immediate child of this element.
`boolean` | `remove(Text text)` Removes the given `Text` if the node is an immediate child of this element.
`void` | `setAttributes(List attributes)` Sets the attributes that this element contains
`void` | `setAttributeValue(QName qName, String value)` Deprecated. As of version 0.5. Please use `addAttribute(QName,String)` instead. WILL BE REMOVED IN dom4j-1.6 !!
`void` | `setAttributeValue(String name, String value)` Deprecated. As of version 0.5. Please use `addAttribute(String,String)` instead. WILL BE REMOVED IN dom4j-1.6 !!
`void` | `setData(Object data)` Sets the data value of this element if this element supports data binding or calls `Node.setText(java.lang.String)`if it doesn't
`void` | `setQName(QName qname)` Sets the `QName` of this element which represents the local name, the qualified name and the `Namespace`.

Methods inherited from interface org.dom4j.Branch
`add, add, add, add, addElement, addElement, addElement, appendContent, clearContent, content, elementByID, indexOf, node, nodeCount, nodeIterator, normalize, processingInstruction, processingInstructions, processingInstructions, remove, remove, remove, remove, removeProcessingInstruction, setContent, setProcessingInstructions`

Methods inherited from interface org.dom4j.Node
`accept, asXML, asXPathResult, clone, createXPath, detach, getDocument, getName, getNodeType, getNodeTypeName, getParent, getPath, getPath, getUniquePath, getUniquePath, hasContent, isReadOnly, matches, numberValueOf, selectNodes, selectNodes, selectNodes, selectObject, selectSingleNode, setDocument, setName, setParent, setText, supportsParent, valueOf, write`

Method Detail

### getQName

    public QName getQName()

  Returns the `QName` of this element which represents the local name, the qualified name and the `Namespace`.

  Returns:
    the `QName` associated with this element

### setQName

    public void setQName(QName qname)

  Sets the `QName` of this element which represents the local name, the qualified name and the `Namespace`.

  Parameters:
    `qname` - is the `QName` to be associated with this element

### getNamespace

    public Namespace getNamespace()

  Returns the `Namespace` of this element if one exists otherwise `Namespace.NO_NAMESPACE` is returned.

  Returns:
    the `Namespace` associated with this element

### getQName

    public QName getQName(String qualifiedName)

  Returns the `QName` for the given qualified name, using the namespace URI in scope for the given prefix of the qualified name or the default namespace if the qualified name has no prefix.

  Parameters:
    `qualifiedName` - DOCUMENT ME!
  Returns:
    the `QName` for the given qualified name

### getNamespaceForPrefix

    public Namespace getNamespaceForPrefix(String prefix)

  Returns the `Namespace` which is mapped to the given prefix or null if it could not be found.

  Parameters:
    `prefix` - DOCUMENT ME!
  Returns:
    the `Namespace` associated with the given prefix

### getNamespaceForURI

    public Namespace getNamespaceForURI(String uri)

  Returns the `Namespace` which is mapped to the given URI or null if it could not be found. If there is more than one `Namespace` mapped to the URI, which of them will be returned is undetermined.

  Parameters:
    `uri` - DOCUMENT ME!
  Returns:
    the `Namespace` associated with the given URI

### getNamespacesForURI

    public List getNamespacesForURI(String uri)

  Returns the all namespaces which are mapped to the given URI or an empty list if no such namespaces could be found.

  Parameters:
    `uri` - DOCUMENT ME!
  Returns:
    the namespaces associated with the given URI
  Since:
    1.5

### getNamespacePrefix

    public String getNamespacePrefix()

  Returns the namespace prefix of this element if one exists otherwise an empty `String` is returned.

  Returns:
    the prefix of the `Namespace` of this element or an empty `String`

### getNamespaceURI

    public String getNamespaceURI()

  Returns the URI mapped to the namespace of this element if one exists otherwise an empty `String` is returned.

  Returns:
    the URI for the `Namespace` of this element or an empty `String`

### getQualifiedName

    public String getQualifiedName()

  Returns the fully qualified name of this element. This will be the same as the value returned from `Node.getName()`if this element has no namespace attached to this element or an expression of the form

       getNamespacePrefix() + ":" + getName()

  will be returned.

  Returns:
    the fully qualified name of the element.

### additionalNamespaces

    public List additionalNamespaces()

  Returns any additional namespaces declarations for this element other than namespace returned via the `getNamespace()`method. If no additional namespace declarations are present for this element then an empty list will be returned. The list is backed by the element such that changes to the list will be reflected in the element though the reverse is not the case.

  Returns:
    a list of any additional namespace declarations.

### declaredNamespaces

    public List declaredNamespaces()

  Returns all the namespaces declared by this element. If no namespaces are declared for this element then an empty list will be returned. The list is backed by the element such that changes to the list will be reflected in the element though the reverse is not the case.

  Returns:
    a list of namespaces declared for this element.

### addAttribute

    public Element addAttribute(String name,
                                String value)

  Adds the attribute value of the given local name. If an attribute already exists for the given name it will be replaced. Attributes with null values are silently ignored. If the value of the attribute is null then this method call will remove any attributes with the given name.

  Parameters:
    `name` - is the name of the attribute whose value is to be added or updated
    `value` - is the attribute's value
  Returns:
    this `Element` instance.

### addAttribute

    public Element addAttribute(QName qName,
                                String value)

  Adds the attribute value of the given fully qualified name. If an attribute already exists for the given name it will be replaced. Attributes with null values are silently ignored. If the value of the attribute is null then this method call will remove any attributes with the given name.

  Parameters:
    `qName` - is the fully qualified name of the attribute whose value is to be added or updated
    `value` - is the attribute's value
  Returns:
    this `Element` instance.

### addComment

    public Element addComment(String comment)

  Adds a new `Comment` node with the given text to this element.

  Parameters:
    `comment` - is the text for the `Comment` node.
  Returns:
    this `Element` instance.

### addCDATA

    public Element addCDATA(String cdata)

  Adds a new `CDATA` node with the given text to this element.

  Parameters:
    `cdata` - is the text for the `CDATA` node.
  Returns:
    this `Element` instance.

### addEntity

    public Element addEntity(String name,
                             String text)

  Adds a new `Entity` node with the given name and text to this element and returns a reference to the new node.

  Parameters:
    `name` - is the name for the `Entity` node.
    `text` - is the text for the `Entity` node.
  Returns:
    this `Element` instance.

### addNamespace

    public Element addNamespace(String prefix,
                                String uri)

  Adds a namespace to this element for use by its child content

  Parameters:
    `prefix` - is the prefix to use, which should not be null or blank
    `uri` - is the namespace URI
  Returns:
    this `Element` instance.

### addProcessingInstruction

    public Element addProcessingInstruction(String target,
                                            String text)

  Adds a processing instruction for the given target

  Parameters:
    `target` - is the target of the processing instruction
    `text` - is the textual data (key/value pairs) of the processing instruction
  Returns:
    this `Element` instance.

### addProcessingInstruction

    public Element addProcessingInstruction(String target,
                                            Map data)

  Adds a processing instruction for the given target

  Parameters:
    `target` - is the target of the processing instruction
    `data` - is a Map of the key / value pairs of the processing instruction
  Returns:
    this `Element` instance.

### addText

    public Element addText(String text)

  Adds a new `Text` node with the given text to this element.

  Parameters:
    `text` - is the text for the `Text` node.
  Returns:
    this `Element` instance.

### add

    public void add(Attribute attribute)

  Adds the given `Attribute` to this element. If the given node already has a parent defined then an `IllegalAddException` will be thrown. Attributes with null values are silently ignored.

  If the value of the attribute is null then this method call will remove any attributes with the QName of this attribute.

  Parameters:
    `attribute` - is the attribute to be added

### add

    public void add(CDATA cdata)

  Adds the given `CDATA` to this element. If the given node already has a parent defined then an `IllegalAddException` will be thrown.

  Parameters:
    `cdata` - is the CDATA to be added

### add

    public void add(Entity entity)

  Adds the given `Entity` to this element. If the given node already has a parent defined then an `IllegalAddException` will be thrown.

  Parameters:
    `entity` - is the entity to be added

### add

    public void add(Text text)

  Adds the given `Text` to this element. If the given node already has a parent defined then an `IllegalAddException` will be thrown.

  Parameters:
    `text` - is the text to be added

### add

    public void add(Namespace namespace)

  Adds the given `Namespace` to this element. If the given node already has a parent defined then an `IllegalAddException` will be thrown.

  Parameters:
    `namespace` - is the namespace to be added

### remove

    public boolean remove(Attribute attribute)

  Removes the given `Attribute` from this element.

  Parameters:
    `attribute` - is the attribute to be removed
  Returns:
    true if the attribute was removed

### remove

    public boolean remove(CDATA cdata)

  Removes the given `CDATA` if the node is an immediate child of this element. If the given node is not an immediate child of this element then the `Node.detach()`method should be used instead.

  Parameters:
    `cdata` - is the CDATA to be removed
  Returns:
    true if the cdata was removed

### remove

    public boolean remove(Entity entity)

  Removes the given `Entity` if the node is an immediate child of this element. If the given node is not an immediate child of this element then the `Node.detach()`method should be used instead.

  Parameters:
    `entity` - is the entity to be removed
  Returns:
    true if the entity was removed

### remove

    public boolean remove(Namespace namespace)

  Removes the given `Namespace` if the node is an immediate child of this element. If the given node is not an immediate child of this element then the `Node.detach()`method should be used instead.

  Parameters:
    `namespace` - is the namespace to be removed
  Returns:
    true if the namespace was removed

### remove

    public boolean remove(Text text)

  Removes the given `Text` if the node is an immediate child of this element. If the given node is not an immediate child of this element then the `Node.detach()`method should be used instead.

  Parameters:
    `text` - is the text to be removed
  Returns:
    true if the text was removed

### getText

    public String getText()

  Returns the text value of this element without recursing through child elements. This method iterates through all `Text`,`CDATA` and `Entity`nodes that this element contains and appends the text values together.

  Specified by:
    `getText` in interface `Node`
  Returns:
    the textual content of this Element. Child elements are not navigated. This method does not return null;

### getTextTrim

    public String getTextTrim()

  DOCUMENT ME!

  Returns:
    the trimmed text value where whitespace is trimmed and normalised into single spaces. This method does not return null.

### getStringValue

    public String getStringValue()

  Returns the XPath string-value of this node. The behaviour of this method is defined in the XPath specification . This method returns the string-value of all the contained `Text`,`CDATA`,`Entity`and `Element` nodes all appended together.

  Specified by:
    `getStringValue` in interface `Node`
  Returns:
    the text from all the child Text and Element nodes appended together.

### getData

    public Object getData()

  Accesses the data of this element which may implement data typing bindings such as XML Schema or Java Bean bindings or will return the same value as `getText()`

  Returns:
    DOCUMENT ME!

### setData

    public void setData(Object data)

  Sets the data value of this element if this element supports data binding or calls `Node.setText(java.lang.String)`if it doesn't

  Parameters:
    `data` - DOCUMENT ME!

### attributes

    public List attributes()

  Returns the `Attribute`instances this element contains as a backed `List`so that the attributes may be modified directly using the `List`interface. The `List` is backed by the `Element` so that changes to the list are reflected in the element and vice versa.

  Returns:
    the attributes that this element contains as a `List`

### setAttributes

    public void setAttributes(List attributes)

  Sets the attributes that this element contains

  Parameters:
    `attributes` - DOCUMENT ME!

### attributeCount

    public int attributeCount()

  DOCUMENT ME!

  Returns:
    the number of attributes this element contains

### attributeIterator

    public Iterator attributeIterator()

  DOCUMENT ME!

  Returns:
    an iterator over the attributes of this element

### attribute

    public Attribute attribute(int index)

  Returns the attribute at the specified indexGets the

  Parameters:
    `index` - DOCUMENT ME!
  Returns:
    the attribute at the specified index where index >= 0 and index < number of attributes or throws an IndexOutOfBoundsException if the index is not within the allowable range

### attribute

    public Attribute attribute(String name)

  Returns the attribute with the given name

  Parameters:
    `name` - DOCUMENT ME!
  Returns:
    the attribute for the given local name in any namespace. If there are more than one attributes with the given local name in different namespaces then the first one is returned.

### attribute

    public Attribute attribute(QName qName)

  DOCUMENT ME!

  Parameters:
    `qName` - is the fully qualified name
  Returns:
    the attribute for the given fully qualified name or null if it could not be found.

### attributeValue

    public String attributeValue(String name)

  This returns the attribute value for the attribute with the given name and any namespace or null if there is no such attribute or the empty string if the attribute value is empty.

  Parameters:
    `name` - is the name of the attribute value to be returnd
  Returns:
    the value of the attribute, null if the attribute does not exist or the empty string

### attributeValue

    public String attributeValue(String name,
                                 String defaultValue)

  This returns the attribute value for the attribute with the given name and any namespace or the default value if there is no such attribute value.

  Parameters:
    `name` - is the name of the attribute value to be returnd
    `defaultValue` - is the default value to be returned if the attribute has no value defined.
  Returns:
    the value of the attribute or the defaultValue if the attribute has no value defined.

### attributeValue

    public String attributeValue(QName qName)

  This returns the attribute value for the attribute with the given fully qualified name or null if there is no such attribute or the empty string if the attribute value is empty.

  Parameters:
    `qName` - is the fully qualified name
  Returns:
    the value of the attribute, null if the attribute does not exist or the empty string

### attributeValue

    public String attributeValue(QName qName,
                                 String defaultValue)

  This returns the attribute value for the attribute with the given fully qualified name or the default value if there is no such attribute value.

  Parameters:
    `qName` - is the fully qualified name
    `defaultValue` - is the default value to be returned if the attribute has no value defined.
  Returns:
    the value of the attribute or the defaultValue if the attribute has no value defined.

### setAttributeValue

    public void setAttributeValue(String name,
                                  String value)

  Deprecated. As of version 0.5. Please use `addAttribute(String,String)` instead. WILL BE REMOVED IN dom4j-1.6 !!

  Sets the attribute value of the given local name.

  Parameters:
    `name` - is the name of the attribute whose value is to be added or updated
    `value` - is the attribute's value

### setAttributeValue

    public void setAttributeValue(QName qName,
                                  String value)

  Deprecated. As of version 0.5. Please use `addAttribute(QName,String)` instead. WILL BE REMOVED IN dom4j-1.6 !!

  Sets the attribute value of the given fully qualified name.

  Parameters:
    `qName` - is the fully qualified name of the attribute whose value is to be added or updated
    `value` - is the attribute's value

### element

    public Element element(String name)

  Returns the first element for the given local name and any namespace.

  Parameters:
    `name` - DOCUMENT ME!
  Returns:
    the first element with the given local name

### element

    public Element element(QName qName)

  Returns the first element for the given fully qualified name.

  Parameters:
    `qName` - is the fully qualified name to search for
  Returns:
    the first element with the given fully qualified name

### elements

    public List elements()

  Returns the elements contained in this element. If this element does not contain any elements then this method returns an empty list. The list is backed by the element such that changes to the list will be reflected in the element though the reverse is not the case.

  Returns:
    a list of all the elements in this element.

### elements

    public List elements(String name)

  Returns the elements contained in this element with the given local name and any namespace. If no elements are found then this method returns an empty list. The list is backed by the element such that changes to the list will be reflected in the element though the reverse is not the case.

  Parameters:
    `name` - DOCUMENT ME!
  Returns:
    a list of all the elements in this element for the given local name

### elements

    public List elements(QName qName)

  Returns the elements contained in this element with the given fully qualified name. If no elements are found then this method returns an empty list. The list is backed by the element such that changes to the list will be reflected in the element though the reverse is not the case.

  Parameters:
    `qName` - is the fully qualified name to search for
  Returns:
    a list of all the elements in this element for the given fully qualified name.

### elementIterator

    public Iterator elementIterator()

  Returns an iterator over all this elements child elements.

  Returns:
    an iterator over the contained elements

### elementIterator

    public Iterator elementIterator(String name)

  Returns an iterator over the elements contained in this element which match the given local name and any namespace.

  Parameters:
    `name` - DOCUMENT ME!
  Returns:
    an iterator over the contained elements matching the given local name

### elementIterator

    public Iterator elementIterator(QName qName)

  Returns an iterator over the elements contained in this element which match the given fully qualified name.

  Parameters:
    `qName` - is the fully qualified name to search for
  Returns:
    an iterator over the contained elements matching the given fully qualified name

### isRootElement

    public boolean isRootElement()

  DOCUMENT ME!

  Returns:
    true if this element is the root element of a document and this element supports the parent relationship else false.

### hasMixedContent

    public boolean hasMixedContent()

  Returns true if this `Element` has mixed content. Mixed content means that an element contains both textual data and child elements.

  Returns:
    true if this element contains mixed content.

### isTextOnly

    public boolean isTextOnly()

  Returns true if this `Element` has text only content.

  Returns:
    true if this element is empty or only contains text content.

### appendAttributes

    public void appendAttributes(Element element)

  Appends the attributes of the given element to me. This method behaves like the `Collection.addAll(java.util.Collection)` method.

  Parameters:
    `element` - is the element whose attributes will be added to me.

### createCopy

    public Element createCopy()

  Creates a deep copy of this element The new element is detached from its parent, and getParent() on the clone will return null.

  Returns:
    a new deep copy Element

### createCopy

    public Element createCopy(String name)

  Creates a deep copy of this element with the given local name The new element is detached from its parent, and getParent() on the clone will return null.

  Parameters:
    `name` - DOCUMENT ME!
  Returns:
    a new deep copy Element

### createCopy

    public Element createCopy(QName qName)

  Creates a deep copy of this element with the given fully qualified name. The new element is detached from its parent, and getParent() on the clone will return null.

  Parameters:
    `qName` - DOCUMENT ME!
  Returns:
    a new deep copy Element

### elementText

    public String elementText(String name)

### elementText

    public String elementText(QName qname)

### elementTextTrim

    public String elementTextTrim(String name)

### elementTextTrim

    public String elementTextTrim(QName qname)

### getXPathResult

    public Node getXPathResult(int index)

  Returns a node at the given index suitable for an XPath result set. This means the resulting Node will either be null or it will support the parent relationship.

  Parameters:
    `index` - DOCUMENT ME!
  Returns:
    the Node for the given index which will support the parent relationship or null if there is not a node at the given index.

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