Bug 119331 Library - name space terminology and behavior
During BIRT 2.0 library feature review meeting the following change was decided. - Change the term namespace to 'prefix' - By default use the library name as the prefix ( namespace ); the dialog to input prefix should be prompted only if hte auto generated prefix is not unique.
UI/org.eclipse.birt.report.designer.core/src/org/eclipse/birt/report/designer/util/DNDUtil.java
return CONTAIN_PARENT;
			}
			return targetHandle.getContainer( )
					.canContain( targetHandle.getContainerSlotHandle( )
							.getSlotID( ),
							childHandle ) ? CONTAIN_PARENT : CONTAIN_NO;
		}
		return CONTAIN_NO;
	}
	/**
	 * Validates target can contain more elements
	 * 
	 * @param targetObj
	 *            target
	 * @param length
	 *            the length of elements in source.If do not add to target, set
	 *            zero
	 * @return whether target can contain more elements
	 */
	public static boolean handleValidateTargetCanContainMore( Object targetObj,
			int length )
	{
		if ( targetObj == null || length < 0 )
		{
			return false;
		}
		if ( targetObj instanceof StructuredSelection )
		{
			return handleValidateTargetCanContainMore( ( (StructuredSelection) targetObj ).toArray( ),
					length );