Bug 149922 Image builder - URI and file source type are treated as same
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/util/StringUtil.java
* 
	 * @param qualifiedName
	 *            the qualified reference value
	 * @return the library namespace
	 */
	public static String extractNamespace( String qualifiedName )
	{
		if ( qualifiedName == null )
			return null;
		int pos = qualifiedName.indexOf( '.' );
		if ( pos == -1 )
			return null;
		return StringUtil.trimString( qualifiedName.substring( 0, pos ) );
	}
	/**
	 * Extracts the name from the given qualified reference value.
	 * 
	 * <p>
	 * For example,
	 * <ul>
	 * <li>"style1" is extracted from "LibA.style1"
	 * <li>"style1" is returned from "style1"
	 * </ul>
	 * 
	 * @param qualifiedName
	 *            the qualified reference value
	 * @return the name
	 */
	public static String extractName( String qualifiedName )
	{