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/core/UserPropertyDefn.java
*/
	public static List getAllowedTypes( )
	{
		if ( allowedTypes != null )
			return allowedTypes;
		allowedTypes = new ArrayList( );
		Iterator iter = MetaDataDictionary.getInstance( ).getPropertyTypes( )
				.iterator( );
		while ( iter.hasNext( ) )
		{
			PropertyType propType = (PropertyType) iter.next( );
			int type = propType.getTypeCode( );
			switch ( type )
			{
				case PropertyType.STRING_TYPE :
				case PropertyType.BOOLEAN_TYPE :
				case PropertyType.DATE_TIME_TYPE :
				case PropertyType.FLOAT_TYPE :
				case PropertyType.INTEGER_TYPE :
				case PropertyType.EXPRESSION_TYPE :
					allowedTypes.add( propType );
					break;
				default :
					break;
			}
		}
		return allowedTypes;
	}
	/**
	 * Gets the value of property by the given property definition.