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
*         dictionary.
	 */
	public IElementDefn getElement( String name );
	
	/**
	 * Gets the metadata for a property type.
	 * 
	 * @param type
	 *            numeric type code
	 * @return property type definition
	 */
	public PropertyType getPropertyType( int type );
	/**
	 * Gets the metadata for a property type given the type's XML name.
	 * 
	 * @param xmlName
	 *            XML name for the property type
	 * 
	 * @return property type definition
	 */
	public PropertyType getPropertyType( String xmlName );
	/**
	 * Returns the meta-data element that defines the style element.
	 * 
	 * @return the definition of the style element
	 */
	public IElementDefn getStyle( );
	/**
	 * Enables the use of element IDs.
	 */