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/metadata/ElementDefn.java
/**
	 * Reports whether the given slot can contain elements of the given type.
	 * 
	 * @param slot
	 *            The slot to check.
	 * @param type
	 *            The element type to check.
	 * @return True if the slot can contain that element type, false if the
	 *         element is not a container, if the slot does not exist, or if the
	 *         slot can't contain that type of element.
	 */
	public boolean canContain( int slot, IElementDefn type )
	{
		if ( slots == null )
			return false;
		if ( slot < 0 || slot > slots.size( ) - 1 )
			return false;
		return ( (SlotDefn) slots.get( slot ) ).canContain( type );
	}
	/**
	 * Determines if the given element type is a kind of this type. It is if
	 * either the given type is the same as this one, or if the given type
	 * derives from this type.
	 * 
	 * @param type
	 *            The element type to check.
	 * @return True if it is a kind of this element, false otherwise.
	 */
	public boolean isKindOf( IElementDefn type )
	{