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copied!<p>From the <a href="http://www.jcp.org/en/jsr/detail?id=314" rel="nofollow">JSF (2.1) spec</a>:</p> <blockquote> <p>The client identifier is derived from the <a href="http://download.oracle.com/javaee/6/api/javax/faces/component/UIComponent.html#getId%28%29" rel="nofollow">component identifier</a> (or the result of calling <a href="http://download.oracle.com/javaee/6/api/javax/faces/component/UIViewRoot.html#createUniqueId%28javax.faces.context.FacesContext,%20java.lang.String%29" rel="nofollow"><code>UIViewRoot.createUniqueId()</code></a> if there is not one), and the client identifier of the closest parent component that is a <a href="http://download.oracle.com/javaee/6/api/javax/faces/component/NamingContainer.html" rel="nofollow"><code>NamingContainer</code></a> according to the algorithm specified in the javadoc for <a href="http://download.oracle.com/javaee/6/api/javax/faces/component/UIComponent.html#getClientId%28javax.faces.context.FacesContext%29" rel="nofollow"><code>UIComponent.getClientId()</code></a>. The Renderer associated with this component, if any, will then be asked to convert this client identifier to a form appropriate for sending to the client. The value returned from this method must be the same throughout the lifetime of the component instance unless <code>setId()</code> is called, in which case it will be recalculated by the next call to <code>getClientId()</code>.</p> </blockquote> <p><em>Aside from the spec, 3rd party plugins can affect the client identifier (e.g. protlet bridge APIs)</em></p>

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