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
if ( extendsRef != null && !extendsRef.isResolved( ) )
				resolveExtends( getRoot( ) );
			return extendsRef;
		}
		assert false;
		return null;
	}
	/**
	 * Sets the value of an intrinsic property. This should be called only from
	 * a command or the design parser. The property name must be valid, and the
	 * value must be valid for that property.
	 * <p>
	 * This class has two intrinsic properties:
	 * <ul>
	 * <li><strong>name </strong>-- The element name. The property value must
	 * be null or a String.
	 * <li><strong>extends </strong>-- The element that this element extends.
	 * Must be a String (for an unresolved name), DesignElement (for a resolved
	 * name) or null. The caller should ensure canExtend of this element is
	 * true.
	 * </ul>
	 * 
	 * @param propName
	 *            The name of the intrinsic property.
	 * @param value
	 *            The value to set for the property.
	 */
	protected void setIntrinsicProperty( String propName, Object value )
	{
		if ( propName.equals( NAME_PROP ) )