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
if ( type == this )
			return true;
		if ( type == null )
			return false;
		ElementDefn obj = this.parent;
		while ( obj != null )
		{
			if ( obj == type )
				return true;
			obj = obj.parent;
		}
		return false;
	}
	/**
	 * Adds a slot to this element.
	 * 
	 * @param slot
	 */
	void addSlot( SlotDefn slot )
	{
		if ( slots == null )
			slots = new ArrayList( );
		slots.add( slot );
	}
	/**
	 * Sets the name space ID. Elements can have names. The names are placed
	 * into a name space on the report design. Different kinds of elements
	 * reside in different name spaces. The name space ID identifies which name
	 * space holds elements of this element type.
	 *