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/**

 * Provides the API for creating and building SOAP messages. This package

 * is defined in the <i>SOAP with Attachments API for Java<sup><font size="-2">TM</font></sup>

 * (SAAJ) 1.4</i> specification.

 *

 * <p> The API in the <code>javax.xml.soap</code> package allows you to do the following:

 *

 * <ul>

 *     <li>create a point-to-point connection to a specified endpoint

 *     <li>create a SOAP message

 *     <li>create an XML fragment

 *     <li>add content to the header of a SOAP message

 *     <li>add content to the body of a SOAP message

 *     <li>create attachment parts and add content to them

 *     <li>access/add/modify parts of a SOAP message

 *     <li>create/add/modify SOAP fault information

 *     <li>extract content from a SOAP message

 *     <li>send a SOAP request-response message

 * </ul>

 *

 * <p>

 * In addition the APIs in the <code>javax.xml.soap</code> package extend

 * their  counterparts in the <code>org.w3c.dom</code> package. This means that

 * the  <code>SOAPPart</code> of a <code>SOAPMessage</code> is also a DOM Level

 * 2 <code>Document</code>, and can be manipulated as such by applications,

 * tools and libraries that use DOM (see http://www.w3.org/DOM/ for more information).

 * It is important to note that, while it is possible to use DOM APIs to add

 * ordinary DOM nodes to a SAAJ tree, the SAAJ APIs are still required to return

 * SAAJ types when examining or manipulating the tree. In order to accomplish

 * this the SAAJ APIs (specifically {@link javax.xml.soap.SOAPElement#getChildElements()})

 * are allowed to silently replace objects that are incorrectly typed relative

 * to SAAJ requirements with equivalent objects of the required type. These

 * replacements must never cause the logical structure of the tree to change,

 * so from the perspective of the DOM APIs the tree will remain unchanged. However,

 * the physical composition of the tree will have changed so that references

 * to the nodes that were replaced will refer to nodes that are no longer a

 * part of the tree. The SAAJ APIs are not allowed to make these replacements

 * if they are not required so the replacement objects will never subsequently

 * be silently replaced by future calls to the SAAJ API.

 * <p>

 * What this means in practical terms is that an application that starts to use

 * SAAJ APIs on a tree after manipulating it using DOM APIs must assume that the

 * tree has been translated into an all SAAJ tree and that any references to objects

 * within the tree that were obtained using DOM APIs are no longer valid. Switching

 * from SAAJ APIs to DOM APIs is not allowed to cause invalid references and

 * neither is using SAAJ APIs exclusively. It is only switching from using DOM

 * APIs on a particular SAAJ tree to using SAAJ APIs that causes the risk of

 * invalid references.

 *

 * <h3>Discovery of SAAJ implementation</h3>

 * <p>

 * There are several factories defined in the SAAJ API to discover and load specific implementation:

 *

 * <ul>

 *     <li>{@link javax.xml.soap.SOAPFactory}

 *     <li>{@link javax.xml.soap.MessageFactory}

 *     <li>{@link javax.xml.soap.SOAPConnectionFactory}

 *     <li>{@link javax.xml.soap.SAAJMetaFactory}

 * </ul>

 *

 * First three define {@code newInstance()} method which uses a common lookup procedure to determine

 * the implementation class:

 *

 * <ul>

 *  <li>Checks if a system property with the same name as the factory class is set (e.g.

 *  {@code javax.xml.soap.SOAPFactory}). If such property exists then its value is assumed to be the fully qualified

 *  name of the implementation class. This phase of the look up enables per-JVM override of the SAAJ implementation.

 *  <li>Use the configuration file "jaxm.properties". The file is in standard

 *  {@link java.util.Properties} format and typically located in the

 *  {@code conf} directory of the Java installation. It contains the fully qualified

 *  name of the implementation class with the key being the system property

 *  defined above.

 *  <li> Use the service-provider loading facilities, defined by the {@link java.util.ServiceLoader} class,

 *  to attempt to locate and load an implementation of the service using the {@linkplain

 *  java.util.ServiceLoader#load(java.lang.Class) default loading mechanism}.

 *  <li> Finally, if all the steps above fail, {@link javax.xml.soap.SAAJMetaFactory} instance is used

 *  to locate specific implementation (for {@link javax.xml.soap.MessageFactory} and {@link javax.xml.soap.SOAPFactory})

 *  or platform default implementation is used ({@link javax.xml.soap.SOAPConnectionFactory}).

 *  Whenever {@link javax.xml.soap.SAAJMetaFactory} is used, its lookup procedure to get actual instance is performed.

 * </ul>

 */

package javax.xml.soap;