jdk/src/java.naming/share/classes/javax/naming/spi/package.html
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+
+Provides the means for dynamically plugging in support for accessing
+naming and directory services through the <tt>javax.naming</tt> 
+and related packages.
+
+<p>
+This package defines the service provider interface (SPI) of the Java Naming
+and Directory Interface<font size=-2><sup>TM</sup></font> (JNDI). &nbsp;
+JNDI provides naming and directory functionality to applications
+written in the Java programming language.  It is designed to be
+independent of any specific naming or directory service
+implementation.  Thus a variety of services--new, emerging, and
+already deployed ones--can be accessed in a common way.
+
+<p>
+The JNDI SPI provides the means for creating JNDI service providers,
+through which JNDI applications access different naming and
+directory services.
+
+
+<h4>Plug-in Architecture</h4>
+
+The service provider package allows different implementations to be plugged in
+dynamically.
+These different implementations include those for the
+<em>initial context</em>,
+and implementations for contexts that can be reached 
+from the initial context.
+
+<h4>Java Object Support</h4>
+
+The service provider package provides support 
+for implementors of the
+<tt>javax.naming.Context.lookup()</tt> 
+method and related methods to return Java objects that are natural
+and intuitive for the Java programmer.
+For example, when looking up a printer name from the directory,
+it is natural for you to expect to get
+back a printer object on which to operate.
+
+
+<h4>Multiple Naming Systems (Federation)</h4>
+
+JNDI operations allow applications to supply names that span multiple
+naming systems.  So in the process of completing
+an operation, one service provider might need to interact
+with another service provider, for example, to pass on
+the operation to be continued in the next naming system.
+The service provider package provides support for
+different providers to cooperate to complete JNDI operations.
+
+
+<h2>Package Specification</h2>
+
+The JNDI SPI Specification and related documents can be found in the
+<a href="../../../../technotes/guides/jndi/index.html">JNDI documentation</a>.
+
+@since 1.3
+
+</body>
+</html>
+<body>
+</body>