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
* @see #setValueType(String)
	 * @see org.eclipse.birt.report.model.api.elements.DesignChoiceConstants
	 * 
	 */
	public String getValueType( )
	{
		return getStringProperty( IScalarParameterModel.VALUE_TYPE_PROP );
	}
	/**
	 * Sets the parameter value type for this scalar parameter. Types are
	 * defined in <code>DesignChoiceConstants</code> can be one of the
	 * followings:
	 * 
	 * <ul>
	 * <li><code>PARAM_TYPE_STATIC</code>
	 * <li><code>PARAM_TYPE_DYNAMIC</code>
	 * </ul>
	 * 
	 * @param type
	 *            the type for the scalar parameter
	 * 
	 * @throws SemanticException
	 *             if the input type is not one of above choices.
	 * @see #getValueType()
	 * @see org.eclipse.birt.report.model.api.elements.DesignChoiceConstants
	 * 
	 */
	public void setValueType( String type ) throws SemanticException
	{
		setStringProperty( IScalarParameterModel.VALUE_TYPE_PROP, type );