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/metadata/MetaDataDictionary.java
* @param xmlName
	 *            XML name for the property type
	 * 
	 * @return property type definition
	 */
	public PropertyType getPropertyType( String xmlName )
	{
		for ( int i = 0; i < propertyTypes.length; i++ )
			if ( propertyTypes[i].getName( ).equalsIgnoreCase( xmlName ) )
				return propertyTypes[i];
		return null;
	}
	/**
	 * Returns the meta-data element that defines the style element.
	 * 
	 * @return the definition of the style element
	 */
	public IElementDefn getStyle( )
	{
		return style;
	}
	/**
	 * Resets the dictionary. Clears the cached data. Used primarily for
	 * testing.
	 */
	public static void reset( )
	{
		instance = new MetaDataDictionary( );
	}
	/**