Bug 153040 Template definition should be removed after the report item is deleted
Steps to reproduce: 1.New a report, extends lib.label 2.Convert the label to template report item, and revert it back to the report item 3.Delete the label 4.Remove the included library Expected result: Library can be removed Actual result: A BIRT exception occurred. Plug-in Provider:Eclipse.org Plug-in Name:BIRT Model Plug-in ID:org.eclipse.birt.report.model Version:2.1.0.v20060808-0630 Error Code:Error.LibraryException.LIBRARY_HAS_DESCENDENTS Error Message:The library "Lib" can no be dropped because it has descendents "NewLabel" in the current module.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/metadata/IMetaDataDictionary.java
* Returns the element list. Each one is the instance of
	 * <code>IElementDefn</code>.
	 * 
	 * @return the element list.
	 */
	public List getElements( );
	/**
	 * Returns the structure list. Each one is the instance of
	 * <code>IStructureDefn</code>.
	 * 
	 * @return the structure list.
	 */
	public List getStructures( );
	/**
	 * Gets the predefined style list. Each one is the instance of
	 * <code>IPredefinedStyle</code>;
	 * 
	 * @return the predefined style list.
	 */
	public List getPredefinedStyles( );
	/**
	 * Returns the class list. Each one is the instance of
	 * <code>IClassInfo</code>.
	 * 
	 * @return the class list.
	 */
	public List getClasses( );
	/**
	 * Returns the class definition given the class name.
	 *