Added in API level 8

NamespaceContext

public interface NamespaceContext

javax.xml.namespace.NamespaceContext

---

Interface for read only XML Namespace context processing.

An XML Namespace has the properties:

• Namespace URI: Namespace name expressed as a URI to which the prefix is bound
• prefix: syntactically, this is the part of the attribute name following the XMLConstants.XMLNS_ATTRIBUTE ("xmlns") in the Namespace declaration

example: <element xmlns:prefix="http://Namespace-name-URI">

All get*(*) methods operate in the current scope for Namespace URI and prefix resolution.

Note that a Namespace URI can be bound to multiple prefixes in the current scope. This can occur when multiple XMLConstants.XMLNS_ATTRIBUTE ("xmlns") Namespace declarations occur in the same Start-Tag and refer to the same Namespace URI. e.g.

 <element xmlns:prefix1="http://Namespace-name-URI"
          xmlns:prefix2="http://Namespace-name-URI">
 

This can also occur when the same Namespace URI is used in multiple XMLConstants.XMLNS_ATTRIBUTE ("xmlns") Namespace declarations in the logical parent element hierarchy. e.g.

 <parent xmlns:prefix1="http://Namespace-name-URI">
   <child xmlns:prefix2="http://Namespace-name-URI">
     ...
   </child>
 </parent>
 

A prefix can only be bound to a single Namespace URI in the current scope.

See also:

• javax.XMLConstants for declarations of common XML values
• XML Schema Part2: Datatypes
• Namespaces in XML
• Namespaces in XML Errata

Summary

Public methods
abstract String	getNamespaceURI(String prefix) Get Namespace URI bound to a prefix in the current scope.
abstract String	getPrefix(String namespaceURI) Get prefix bound to Namespace URI in the current scope.
abstract Iterator<E>	getPrefixes(String namespaceURI) Get all prefixes bound to a Namespace URI in the current scope.

Public methods

getNamespaceURI

Added in API level 8

public abstract String getNamespaceURI (String prefix)

Get Namespace URI bound to a prefix in the current scope.

When requesting a Namespace URI by prefix, the following table describes the returned Namespace URI value for all possible prefix values:

getNamespaceURI(prefix) return value for specified prefixes
prefix parameter	Namespace URI return value
DEFAULT_NS_PREFIX ("")	default Namespace URI in the current scope or XMLConstants.NULL_NS_URI("") when there is no default Namespace URI in the current scope
bound prefix	Namespace URI bound to prefix in current scope
unbound prefix	XMLConstants.NULL_NS_URI("")
XMLConstants.XML_NS_PREFIX ("xml")	XMLConstants.XML_NS_URI ("http://www.w3.org/XML/1998/namespace")
XMLConstants.XMLNS_ATTRIBUTE ("xmlns")	XMLConstants.XMLNS_ATTRIBUTE_NS_URI ("http://www.w3.org/2000/xmlns/")
null	IllegalArgumentException is thrown

Parameters
prefix	String: prefix to look up

Returns
String	Namespace URI bound to prefix in the current scope

getPrefix

Added in API level 8

public abstract String getPrefix (String namespaceURI)

Get prefix bound to Namespace URI in the current scope.

To get all prefixes bound to a Namespace URI in the current scope, use getPrefixes(java.lang.String).

When requesting a prefix by Namespace URI, the following table describes the returned prefix value for all Namespace URI values:

getPrefix(namespaceURI) return value for specified Namespace URIs
Namespace URI parameter	prefix value returned
<default Namespace URI>	XMLConstants.DEFAULT_NS_PREFIX ("")
bound Namespace URI	prefix bound to Namespace URI in the current scope, if multiple prefixes are bound to the Namespace URI in the current scope, a single arbitrary prefix, whose choice is implementation dependent, is returned
unbound Namespace URI	null
XMLConstants.XML_NS_URI ("http://www.w3.org/XML/1998/namespace")	XMLConstants.XML_NS_PREFIX ("xml")
XMLConstants.XMLNS_ATTRIBUTE_NS_URI ("http://www.w3.org/2000/xmlns/")	XMLConstants.XMLNS_ATTRIBUTE ("xmlns")
null	IllegalArgumentException is thrown

Parameters
namespaceURI	String: URI of Namespace to lookup

Returns
String	prefix bound to Namespace URI in current context

getPrefixes

Added in API level 8

public abstract Iterator<E> getPrefixes (String namespaceURI)

Get all prefixes bound to a Namespace URI in the current scope.

An Iterator over String elements is returned in an arbitrary, implementation dependent, order.

The Iterator is not modifiable. e.g. the remove() method will throw UnsupportedOperationException.

When requesting prefixes by Namespace URI, the following table describes the returned prefixes value for all Namespace URI values:

getPrefixes(namespaceURI) return value for specified Namespace URIs
Namespace URI parameter	prefixes value returned
bound Namespace URI, including the <default Namespace URI>	Iterator over prefixes bound to Namespace URI in the current scope in an arbitrary, implementation dependent, order
unbound Namespace URI	empty Iterator
XMLConstants.XML_NS_URI ("http://www.w3.org/XML/1998/namespace")	Iterator with one element set to XMLConstants.XML_NS_PREFIX ("xml")
XMLConstants.XMLNS_ATTRIBUTE_NS_URI ("http://www.w3.org/2000/xmlns/")	Iterator with one element set to XMLConstants.XMLNS_ATTRIBUTE ("xmlns")
null	IllegalArgumentException is thrown

Parameters
namespaceURI	String: URI of Namespace to lookup

Returns
Iterator<E>	Iterator for all prefixes bound to the Namespace URI in the current scope