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
* Requester formats, parses and validates the parameter. Types are defined
	 * in <code>DesignChoiceConstants</code> can be one of the followings:
	 * 
	 * <ul>
	 * <li><code>PARAM_TYPE_STRING</code>
	 * <li><code>PARAM_TYPE_FLOAT</code>
	 * <li><code>PARAM_TYPE_DECIMAL</code>
	 * <li><code>PARAM_TYPE_DATETYPE</code>
	 * <li><code>PARAM_TYPE_BOOLEAN</code>
	 * </ul>
	 * 
	 * @param type
	 *            the type for the parameter
	 * 
	 * @throws SemanticException
	 *             if the input type is not one of above choices.
	 * @see #getDataType()
	 * @see org.eclipse.birt.report.model.api.elements.DesignChoiceConstants
	 */
	public void setDataType( String type ) throws SemanticException
	{
		setStringProperty( ScalarParameter.DATA_TYPE_PROP, type );
	}
	/**
	 * Returns the default value of the parameter. The default value can be an
	 * expression, but cannot reference any other parameters.
	 * 
	 * @return the default value
	 */
	public String getDefaultValue( )