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## nu.xom
Class Namespace

    Object
      nu.xom.Node
          nu.xom.Namespace

    public final class Namespace

extends Node

Represents a namespace in scope. It is used by XOM's XPath implementation for the namespace axis. However, it is not really part of the XOM data model. Namespace objects are only created as needed when evaluating XPath. While a namespace node has a parent element (which may be null), that element does not know about these namespace nodes and cannot remove them. (This is an inconsistency in the XPath data model, and is shared with attributes which also have parents but are not children.)

Version:
  1.1b3
Author:
  Elliotte Rusty Harold

Field Summary
`static String` | `XML_NAMESPACE` Namespace URI specified for `xml` prefix

Constructor Summary
`Namespace(String prefix, String URI, Element parent)` Create a new namespace node.

Method Summary
`Node` | `copy()` Returns a copy of this namespace which has the same prefix and URI, but no parent.
`void` | `detach()` Removes this namespace node from its parent.
`Node` | `getChild(int position)` Throws `IndexOutOfBoundsException` because namespaces do not have children.
`int` | `getChildCount()` Returns 0 because namespaces do not have children.
`String` | `getPrefix()` Returns the namespace prefix, or the empty string if this node is the default namespace.
`String` | `getValue()` Returns the namespace URI.
`String` | `toString()` Returns a string form of the `Namespace` suitable for debugging and diagnosis.
`String` | `toXML()` Returns a string containing the actual XML form of the namespace declaration represented by this object.

Methods inherited from class nu.xom.Node
`equals, getBaseURI, getDocument, getParent, hashCode, query, query`

Methods inherited from class Object
`clone, finalize, getClass, notify, notifyAll, wait, wait, wait`

Field Detail

### XML_NAMESPACE

    public static final String XML_NAMESPACE

  Namespace URI specified for `xml` prefix

  See Also:
    Constant Field Values

Constructor Detail

### Namespace

    public Namespace(String prefix,
                     String URI,
                     Element parent)

  Create a new namespace node.

  Parameters:
    `prefix` - the prefix for the namespace; may be the empty string or a non-colonized name
    `URI` - the namespace URI
    `parent` - the element that possesses this namespace node
  Throws:
    `MalformedURIException` - if `URI` is not an RFC 3986 URI reference
    `IllegalNameException` - if
    - The prefix is `xmlns`.
    - The prefix is not the empty string, and the URI is null or the empty string.
    `NamespaceConflictException` - if
    - The prefix is the empty string, and the URI is null or the empty string.
    - The prefix is `xml`, and the URI is not `http://www.w3.org/XML/1998/namespace`.
    - The prefix is not `xml`, and the URI is `http://www.w3.org/XML/1998/namespace`.

Method Detail

### getPrefix

    public String getPrefix()

  Returns the namespace prefix, or the empty string if this node is the default namespace.

  Returns:
    the namespace prefix

### getValue

    public String getValue()

  Returns the namespace URI.

  Specified by:
    `getValue` in class `Node`
  Returns:
    the namespace URI

### getChild

    public Node getChild(int position)

  Throws `IndexOutOfBoundsException` because namespaces do not have children.

  Specified by:
    `getChild` in class `Node`
  Parameters:
    `position` - the index of the child node to return
  Returns:
    never returns because document type declarations do not have children. Always throws an exception.
  Throws:
    `IndexOutOfBoundsException` - because document type declarations do not have children

### getChildCount

    public int getChildCount()

  Returns 0 because namespaces do not have children.

  Specified by:
    `getChildCount` in class `Node`
  Returns:
    zero

### copy

    public Node copy()

  Returns a copy of this namespace which has the same prefix and URI, but no parent.

  Specified by:
    `copy` in class `Node`
  Returns:
    a copy of this `Namespace` that is not part of a document

### detach

    public void detach()

  Removes this namespace node from its parent.

  Overrides:
    `detach` in class `Node`
  See Also:
    `Node.detach()`

### toXML

    public String toXML()

  Returns a string containing the actual XML form of the namespace declaration represented by this object. For example, `xmlns:pre="http://www.example.org/"`.

  Specified by:
    `toXML` in class `Node`
  Returns:
    a `String` containing an XML namespace declaration

### toString

    public String toString()

  Returns a string form of the `Namespace` suitable for debugging and diagnosis. It deliberately does not return an actual XML namespace declaration.

  Overrides:
    `toString` in class `Object`
  Returns:
    a string representation of this object

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Copyright 2002-2006 Elliotte Rusty Harold
elharo@metalab.unc.edu