Bug 141709 The Interface "IScalarParameterModel" should provide a "TEXT_ID_PROP" member.
In order to provide the "Localization" function in Property Editor of Parameter, it requires to implement a "ScalarParameterI18nPage" Class similar to the Class of "LabelI18nPage", and it consequently needs to "IScalarParameterModel" provide a "TEXT_ID_PROP" member for "ScalarParameterHandle" Class.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/ScalarParameterHandle.java
* 
	 * @param concealValue
	 *            <code>true</code> if hides the user's entry by asterisks,
	 *            <code>false</code> if shows characters as usual.
	 * @throws SemanticException
	 *             if the property is locked.
	 */
	public void setConcealValue( boolean concealValue )
			throws SemanticException
	{
		setProperty( ScalarParameter.CONCEAL_VALUE_PROP, Boolean
				.valueOf( concealValue ) );
	}
	/**
	 * Tests whether the value of the parameter can be <code>null</code>.
	 * 
	 * @return <code>true</code> if the value can be <code>null</code>,
	 *         <code>false</code> if the value can not be <code>null</code>.
	 */
	public boolean allowNull( )
	{
		return getBooleanProperty( ScalarParameter.ALLOW_NULL_PROP );
	}
	/**
	 * Sets the flag that indicates whether the value of the parameter can be
	 * <code>null</code>.
	 * 
	 * @param allowNull
	 *            <code>true</code> if the value can be <code>null</code>,
	 *            <code>false</code> if the value can not be <code>null</code>.