Bug 152430 Key can modify to empty string
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/DataSetParameterHandle.java
*            <code>false</code>.
	 */
	public void setIsOutput( boolean isOutput )
	{
		setPropertySilently( DataSetParameter.IS_OUTPUT_MEMBER, Boolean
				.valueOf( isOutput ) );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.model.api.StructureHandle#getMember(java.lang.String)
	 */
	public MemberHandle getMember( String memberName )
	{
		StructPropertyDefn memberDefn = (StructPropertyDefn) getDefn( )
				.getMember( memberName );
		if ( memberDefn == null )
			return null;
		if ( DesignSchemaConstants.NAME_ATTRIB.equalsIgnoreCase( memberName ) )
			return new NameMemberHandle( this, memberDefn );
		else
			return new MemberHandle( this, memberDefn );
	}
	/**
	 * Returns the native data type.
	 * 
	 * @return the parameter native data type.
	 */
	public Integer getNativeDataType( )
	{