Bug 197589 Need constant for automaic attribute name "DateTime"
Currently when set dateTimeLevelType for cube level, model will automatically create a built-in attribute "DateTime". But the name is hard-coded. We need a public constant for this name to allow UI to access it.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/elements/structures/LevelAttribute.java
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 * Copyright (c) 2004 Actuate Corporation.
 * All rights reserved. This program and the accompanying materials
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 * Contributors:
 *  Actuate Corporation  - initial API and implementation
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package org.eclipse.birt.report.model.api.elements.structures;
import java.util.List;