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+/**
+ * @author Ed Spencer
+ * @class Ext.data.proxy.SessionStorage
+ * @extends Ext.data.proxy.WebStorage
+ * 
+ * <p>Proxy which uses HTML5 session storage as its data storage/retrieval mechanism.
+ * If this proxy is used in a browser where session storage is not supported, the constructor will throw an error.
+ * A session storage proxy requires a unique ID which is used as a key in which all record data are stored in the
+ * session storage object.</p>
+ * 
+ * <p>It's important to supply this unique ID as it cannot be reliably determined otherwise. If no id is provided
+ * but the attached store has a storeId, the storeId will be used. If neither option is presented the proxy will
+ * throw an error.</p>
+ * 
+ * <p>Proxies are almost always used with a {@link Ext.data.Store store}:<p>
+ * 
+<pre><code>
+new Ext.data.Store({
+    proxy: {
+        type: 'sessionstorage',
+        id  : 'myProxyKey'
+    }
+});
+</code></pre>
+ * 
+ * <p>Alternatively you can instantiate the Proxy directly:</p>
+ * 
+<pre><code>
+new Ext.data.proxy.SessionStorage({
+    id  : 'myOtherProxyKey'
+});
+ </code></pre>
+ * 
+ * <p>Note that session storage is different to local storage (see {@link Ext.data.proxy.LocalStorage}) - if a browser
+ * session is ended (e.g. by closing the browser) then all data in a SessionStorageProxy are lost. Browser restarts
+ * don't affect the {@link Ext.data.proxy.LocalStorage} - the data are preserved.</p>
+ */
+Ext.define('Ext.data.proxy.SessionStorage', {
+    extend: 'Ext.data.proxy.WebStorage',
+    alias: 'proxy.sessionstorage',
+    alternateClassName: 'Ext.data.SessionStorageProxy',
+    
+    //inherit docs
+    getStorageObject: function() {
+        return window.sessionStorage;
+    }
+});