Bug 149251 Inconsistent Handling of a Non-inheritable ROM Property
For a ROM property defined to be non-inheritable, an empty string property value should be consistently handled as an empty string, not as null. For example, an oda.dataSource extension defines a data source property with canInherit=false. When a oda-data-source handle get saved in a report design, it correctly includes the tag for such property, even when an empty string value is specified. <oda-data-source extensionID="my.oda.plugin" name="my Data Source" id="24"> ... <property name="ApplicationServer"></property> </oda-data-source> However, later when using the DE API to read its property value, a null is returned. Then when the report design is subsequently saved, the property tag is lost. Expects that an empty string value of a non-inhertiable property should be preserved.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/core/DesignElement.java
*         template element; otherwise true
	 */
	private boolean canContainTemplateElement( Module module, int slotID,
			DesignElement element )
	{
		
		
		IElementDefn defn = MetaDataDictionary.getInstance( ).getElement(
				ReportDesignConstants.TEMPLATE_ELEMENT );
		if ( element instanceof TemplateElement )
			return canContainTemplateElement( module, slotID, defn );
		ContentIterator contents = new ContentIterator( element );
		while ( contents.hasNext( ) )
		{
			DesignElement content = (DesignElement) contents.next( );
			if ( content instanceof TemplateElement )
				return canContainTemplateElement( module, slotID, defn );
		}
		return true;
	}
	/**
	 * Checks whether the element to insert can reside in the given module.
	 * 
	 * @param module
	 *            the root module of the element to add
	 * @param slotID
	 *            the slot ID to insert
	 * @param defn
	 *            the definition of element to insert
	 * @return false if the module is a library and the element to insert is a